feat: groupes de travail (P5)

Ajoute la notion de groupe — collection nommée de repos (membership légère
persistée, many-to-many) — pour piloter plusieurs repos en simultané :

- DB : migration #5 (tables groups + group_repos, FK ON DELETE CASCADE).
- GroupManager (synchrone, EventEmitter) + routes REST /api/v1/groups ;
  ne persiste que la membership, worktrees/sessions filtrés par repoId côté client.
- Protocole : GroupSummary, DTOs, topic WS « groups », events group_update/removed
  (additifs, PROTOCOL_VERSION inchangé).
- Web : store groups, GroupsListView, GroupView (réutilise RepoSection),
  grille multi-terminaux (TerminalGrid/TerminalCell), action « feature cross-repo »
  (orchestration client, tolérante aux échecs partiels), routes + i18n EN/FR.
- Tests : group-manager.test.ts + extension protocol.test.ts ; acceptance-p5.mjs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/web/src/components/CrossRepoFeatureModal.vue

@@ -0,0 +1,122 @@
+<template>
+  <div class="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4" @click.self="emit('close')">
+    <div class="flex max-h-[90vh] w-full max-w-lg flex-col gap-3 overflow-y-auto rounded-lg border border-zinc-800 bg-zinc-900 p-4">
+      <header class="flex items-center gap-2">
+        <h2 class="font-semibold text-zinc-100">{{ t('crossRepo.title') }}</h2>
+        <button class="btn ml-auto text-xs" @click="emit('close')">{{ t('crossRepo.close') }}</button>
+      </header>
+      <p class="text-xs text-zinc-500">{{ t('crossRepo.intro') }}</p>
+
+      <form class="flex flex-col gap-3" @submit.prevent="onSubmit">
+        <label class="flex flex-col gap-1 text-xs text-zinc-400">
+          {{ t('crossRepo.branchLabel') }}
+          <input v-model="branch" class="input font-mono" :placeholder="t('crossRepo.branchPlaceholder')" required />
+        </label>
+        <div class="flex flex-wrap items-end gap-3">
+          <label class="flex items-center gap-1.5 text-xs text-zinc-400">
+            <input v-model="newBranch" type="checkbox" /> {{ t('crossRepo.newBranch') }}
+          </label>
+          <label class="flex flex-col gap-1 text-xs text-zinc-400">
+            {{ t('crossRepo.baseRefLabel') }}
+            <input v-model="baseRef" class="input font-mono" placeholder="HEAD" />
+          </label>
+          <label class="flex flex-col gap-1 text-xs text-zinc-400">
+            {{ t('crossRepo.startLabel') }}
+            <select v-model="startSession" class="input">
+              <option :value="null">{{ t('crossRepo.startNone') }}</option>
+              <option value="claude">claude</option>
+              <option value="bash">bash</option>
+            </select>
+          </label>
+        </div>
+
+        <div class="flex flex-col gap-1 text-xs text-zinc-400">
+          {{ t('crossRepo.reposLabel') }}
+          <div class="flex flex-col gap-1">
+            <label
+              v-for="repo in repos"
+              :key="repo.id"
+              class="flex items-center gap-2 rounded border border-zinc-800 bg-zinc-950/40 px-2 py-1"
+            >
+              <input v-model="selectedRepoIds" type="checkbox" :value="repo.id" :disabled="running" />
+              <span class="flex-1 text-zinc-300">{{ repo.label }}</span>
+              <span v-if="results[repo.id]" class="text-[11px]" :class="statusClass(repo.id)">
+                {{ statusText(repo.id) }}
+              </span>
+            </label>
+          </div>
+        </div>
+
+        <div class="flex items-center gap-2">
+          <button type="submit" class="btn-primary" :disabled="running || branch.trim() === '' || selectedRepoIds.length === 0">
+            {{ running ? t('crossRepo.creating') : t('crossRepo.create', { n: selectedRepoIds.length }) }}
+          </button>
+          <button v-if="hasFailures && !running" type="button" class="btn text-xs" @click="retryFailed">
+            {{ t('crossRepo.retryFailed') }}
+          </button>
+        </div>
+      </form>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed, ref } from 'vue';
+import { useI18n } from 'vue-i18n';
+import type { RepoSummary } from '@arboretum/shared';
+import { useGroupsStore, type CrossRepoResult } from '../stores/groups';
+
+const props = defineProps<{ repos: RepoSummary[] }>();
+const emit = defineEmits<{ close: [] }>();
+
+const { t } = useI18n();
+const groups = useGroupsStore();
+
+const branch = ref('');
+const newBranch = ref(true);
+const baseRef = ref('');
+const startSession = ref<'claude' | 'bash' | null>(null);
+const selectedRepoIds = ref<string[]>(props.repos.map((r) => r.id));
+const results = ref<Record<string, CrossRepoResult>>({});
+const running = ref(false);
+
+const hasFailures = computed(() => Object.values(results.value).some((r) => r.status === 'error'));
+
+function statusClass(repoId: string): string {
+  return results.value[repoId]?.status === 'ok' ? 'text-emerald-400' : 'text-red-400';
+}
+function statusText(repoId: string): string {
+  const r = results.value[repoId];
+  if (!r) return '';
+  return r.status === 'ok' ? t('crossRepo.ok') : `${t('crossRepo.error')}: ${r.message ?? ''}`;
+}
+
+async function run(repoIds: string[]): Promise<void> {
+  if (repoIds.length === 0) return;
+  running.value = true;
+  for (const id of repoIds) delete results.value[id];
+  try {
+    await groups.createCrossRepoFeature(
+      repoIds,
+      {
+        branch: branch.value.trim(),
+        newBranch: newBranch.value,
+        ...(baseRef.value.trim() ? { baseRef: baseRef.value.trim() } : {}),
+        startSession: startSession.value,
+      },
+      (result) => {
+        results.value = { ...results.value, [result.repoId]: result };
+      },
+    );
+  } finally {
+    running.value = false;
+  }
+}
+
+function onSubmit(): void {
+  void run([...selectedRepoIds.value]);
+}
+function retryFailed(): void {
+  void run(Object.values(results.value).filter((r) => r.status === 'error').map((r) => r.repoId));
+}
+</script>

packages/web/src/components/TerminalCell.vue

@@ -0,0 +1,39 @@
+<template>
+  <!-- focus-within → anneau visuel : montre quelle cellule reçoit la frappe clavier -->
+  <div class="flex min-h-0 flex-col overflow-hidden rounded-lg border border-zinc-800 bg-[#09090b] focus-within:ring-2 focus-within:ring-sky-600">
+    <header class="flex items-center gap-2 border-b border-zinc-800 px-2 py-1">
+      <SessionStateBadge :session="session" />
+      <span class="truncate font-mono text-xs text-zinc-300" :title="session.cwd">{{ title }}</span>
+      <span class="ml-auto shrink-0 font-mono text-[11px] text-zinc-500">{{ session.command }}</span>
+    </header>
+    <DialogPrompt v-if="isWaiting" :session="session" class="px-2 pt-2" />
+    <div class="min-h-0 flex-1">
+      <TerminalView :session-id="session.id" mode="interactive" />
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+import type { SessionSummary } from '@arboretum/shared';
+import { useWorktreesStore } from '../stores/worktrees';
+import SessionStateBadge from './SessionStateBadge.vue';
+import DialogPrompt from './DialogPrompt.vue';
+import TerminalView from './TerminalView.vue';
+
+const props = defineProps<{ session: SessionSummary }>();
+const worktrees = useWorktreesStore();
+
+// libellé : « repo · branche » si le worktree est connu, sinon le dernier segment du cwd.
+const title = computed(() => {
+  const wt = worktrees.worktrees.find((w) => w.path === props.session.cwd);
+  if (wt) {
+    const repo = worktrees.repos.find((r) => r.id === wt.repoId);
+    const branch = wt.branch ?? wt.head.slice(0, 7);
+    return repo ? `${repo.label} · ${branch}` : branch;
+  }
+  return props.session.cwd.split('/').filter(Boolean).pop() ?? props.session.cwd;
+});
+
+const isWaiting = computed(() => props.session.live && props.session.activity === 'waiting' && !!props.session.dialog);
+</script>

packages/web/src/components/TerminalGrid.vue

@@ -0,0 +1,28 @@
+<template>
+  <div class="flex flex-col gap-2">
+    <p v-if="sessions.length === 0" class="text-sm text-zinc-500">{{ t('groups.gridEmpty') }}</p>
+    <template v-else>
+      <p v-if="sessions.length > MAX_CELLS" class="text-xs text-amber-400">
+        {{ t('groups.gridCapped', { shown: MAX_CELLS, total: sessions.length }) }}
+      </p>
+      <!-- une seule socket WS multiplexe tous les terminaux ; cap dur pour préserver GPU/canaux.
+           Sur mobile la grille retombe à une colonne (empilement). -->
+      <div class="grid grid-cols-1 gap-3 lg:grid-cols-2 2xl:grid-cols-3">
+        <TerminalCell v-for="s in shown" :key="s.id" :session="s" class="h-80" />
+      </div>
+    </template>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+import { useI18n } from 'vue-i18n';
+import type { SessionSummary } from '@arboretum/shared';
+import TerminalCell from './TerminalCell.vue';
+
+const props = defineProps<{ sessions: SessionSummary[] }>();
+const { t } = useI18n();
+
+const MAX_CELLS = 6;
+const shown = computed(() => props.sessions.slice(0, MAX_CELLS));
+</script>

packages/web/src/i18n/en.ts

@@ -61,6 +61,54 @@ export default {
   dashboard: {
     title: 'Worktrees',
     allSessions: 'All sessions',
+    groups: 'Groups',
+  },
+  groups: {
+    title: 'Groups',
+    new: 'New group',
+    create: 'Create',
+    creating: 'Creating…',
+    nameLabel: 'Group name',
+    namePlaceholder: 'e.g. Payments stack',
+    colorLabel: 'Color',
+    reposLabel: 'Repositories',
+    empty: 'No group yet — create one above.',
+    noRepos: 'No repository selected.',
+    noReposInGroup: 'No repository in this group yet — add some below.',
+    noReposRegistered: 'No repository registered yet — add some from the dashboard first.',
+    open: 'Open',
+    edit: 'Edit repositories',
+    editDone: 'Done',
+    remove: 'Delete',
+    confirmDelete: 'Confirm delete',
+    repoCount: 'no repo | 1 repo | {n} repos',
+    dashboard: 'Dashboard',
+    missingRepo: 'Repository unavailable',
+    removeFromGroup: 'Remove from group',
+    sessionsActive: 'no active session | 1 active session | {n} active sessions',
+    viewList: 'Repos',
+    viewGrid: 'Terminals',
+    gridEmpty: 'No active session in this group.',
+    gridCapped: 'Showing {shown} of {total} sessions — close some terminals to see the rest.',
+    newFeature: 'New cross-repo feature',
+  },
+  crossRepo: {
+    title: 'New cross-repo feature',
+    intro: 'Create the same worktree across the selected repos, in one action.',
+    branchLabel: 'Branch name',
+    branchPlaceholder: 'feature/…',
+    newBranch: 'create branch',
+    baseRefLabel: 'Base ref (optional)',
+    startLabel: 'Start session',
+    startNone: 'no session',
+    reposLabel: 'Apply to',
+    create: 'Create across {n} repos',
+    creating: 'Creating…',
+    retryFailed: 'Retry failed',
+    close: 'Close',
+    pending: 'pending…',
+    ok: 'created',
+    error: 'failed',
   },
   repos: {
     add: 'Add repo',

packages/web/src/i18n/fr.ts

@@ -63,6 +63,54 @@ const fr: typeof en = {
   dashboard: {
     title: 'Worktrees',
     allSessions: 'Toutes les sessions',
+    groups: 'Groupes',
+  },
+  groups: {
+    title: 'Groupes',
+    new: 'Nouveau groupe',
+    create: 'Créer',
+    creating: 'Création…',
+    nameLabel: 'Nom du groupe',
+    namePlaceholder: 'ex. Stack paiements',
+    colorLabel: 'Couleur',
+    reposLabel: 'Dépôts',
+    empty: 'Aucun groupe — créez-en un ci-dessus.',
+    noRepos: 'Aucun dépôt sélectionné.',
+    noReposInGroup: 'Aucun dépôt dans ce groupe — ajoutez-en ci-dessous.',
+    noReposRegistered: 'Aucun dépôt enregistré — ajoutez-en d’abord depuis le tableau de bord.',
+    open: 'Ouvrir',
+    edit: 'Modifier les dépôts',
+    editDone: 'Terminé',
+    remove: 'Supprimer',
+    confirmDelete: 'Confirmer',
+    repoCount: 'aucun dépôt | 1 dépôt | {n} dépôts',
+    dashboard: 'Tableau de bord',
+    missingRepo: 'Dépôt indisponible',
+    removeFromGroup: 'Retirer du groupe',
+    sessionsActive: 'aucune session active | 1 session active | {n} sessions actives',
+    viewList: 'Dépôts',
+    viewGrid: 'Terminaux',
+    gridEmpty: 'Aucune session active dans ce groupe.',
+    gridCapped: '{shown} sessions affichées sur {total} — fermez des terminaux pour voir le reste.',
+    newFeature: 'Nouvelle feature cross-repo',
+  },
+  crossRepo: {
+    title: 'Nouvelle feature cross-repo',
+    intro: 'Crée le même worktree dans les dépôts sélectionnés, en une seule action.',
+    branchLabel: 'Nom de branche',
+    branchPlaceholder: 'feature/…',
+    newBranch: 'créer la branche',
+    baseRefLabel: 'Réf. de base (optionnel)',
+    startLabel: 'Démarrer une session',
+    startNone: 'aucune session',
+    reposLabel: 'Appliquer à',
+    create: 'Créer dans {n} dépôts',
+    creating: 'Création…',
+    retryFailed: 'Réessayer les échecs',
+    close: 'Fermer',
+    pending: 'en cours…',
+    ok: 'créé',
+    error: 'échec',
   },
   repos: {
     add: 'Ajouter un repo',

packages/web/src/lib/api.ts

@@ -34,5 +34,6 @@ async function request<T>(path: string, method: string, body?: unknown): Promise
 export const api = {
   get: <T>(path: string): Promise<T> => request<T>(path, 'GET'),
   post: <T>(path: string, body?: unknown): Promise<T> => request<T>(path, 'POST', body),
+  patch: <T>(path: string, body?: unknown): Promise<T> => request<T>(path, 'PATCH', body),
   delete: <T>(path: string): Promise<T> => request<T>(path, 'DELETE'),
 };

packages/web/src/lib/ws-client.ts

@@ -28,6 +28,7 @@ export interface TerminalSink {
 
 export type SessionEvent = Extract<ServerMessage, { type: 'session_update' | 'session_exit' }>;
 export type WorktreeEvent = Extract<ServerMessage, { type: 'repo_update' | 'repo_removed' | 'worktree_update' | 'worktree_removed' }>;
+export type GroupEvent = Extract<ServerMessage, { type: 'group_update' | 'group_removed' }>;
 
 export interface AttachOptions {
   sessionId: string;
@@ -116,6 +117,7 @@ export class WsClient {
   private awaitingAttached: Attachment[] = [];
   private readonly sessionListeners = new Set<(e: SessionEvent) => void>();
   private readonly worktreeListeners = new Set<(e: WorktreeEvent) => void>();
+  private readonly groupListeners = new Set<(e: GroupEvent) => void>();
 
   connect(): void {
     this.stopped = false;
@@ -156,10 +158,11 @@ export class WsClient {
   }
 
   /** topics actifs = union des abonnements courants (une seule connexion partagée). */
-  private activeTopics(): Array<'sessions' | 'worktrees'> {
-    const t: Array<'sessions' | 'worktrees'> = [];
+  private activeTopics(): Array<'sessions' | 'worktrees' | 'groups'> {
+    const t: Array<'sessions' | 'worktrees' | 'groups'> = [];
     if (this.sessionListeners.size > 0) t.push('sessions');
     if (this.worktreeListeners.size > 0) t.push('worktrees');
+    if (this.groupListeners.size > 0) t.push('groups');
     return t;
   }
 
@@ -187,6 +190,16 @@ export class WsClient {
     };
   }
 
+  subscribeGroups(listener: (e: GroupEvent) => void): () => void {
+    this.groupListeners.add(listener);
+    this.connect();
+    this.sendSub();
+    return () => {
+      this.groupListeners.delete(listener);
+      this.sendSub();
+    };
+  }
+
   sendControl(msg: ClientMessage): void {
     if (!this.ready || this.socket?.readyState !== WebSocket.OPEN) return;
     this.socket.send(JSON.stringify(msg));
@@ -380,6 +393,11 @@ export class WsClient {
         for (const cb of this.worktreeListeners) cb(msg);
         return;
       }
+      case 'group_update':
+      case 'group_removed': {
+        for (const cb of this.groupListeners) cb(msg);
+        return;
+      }
       case 'error': {
         if (msg.channel !== undefined) {
           console.warn(`[ws] channel ${msg.channel}: ${msg.code} — ${msg.message}`);

packages/web/src/router/index.ts

@@ -8,6 +8,8 @@ export const router = createRouter({
     { path: '/', name: 'dashboard', component: () => import('../views/DashboardView.vue') },
     { path: '/sessions', name: 'sessions', component: () => import('../views/SessionsListView.vue') },
     { path: '/sessions/:id', name: 'session', component: () => import('../views/SessionView.vue') },
+    { path: '/groups', name: 'groups', component: () => import('../views/GroupsListView.vue') },
+    { path: '/groups/:id', name: 'group', component: () => import('../views/GroupView.vue') },
     { path: '/:pathMatch(.*)*', redirect: '/' },
   ],
 });

packages/web/src/stores/groups.ts

@@ -0,0 +1,175 @@
+import { defineStore } from 'pinia';
+import { ref } from 'vue';
+import type {
+  CreateGroupRequest,
+  CreateWorktreeRequest,
+  GroupResponse,
+  GroupsListResponse,
+  GroupSummary,
+  RepoSummary,
+  SessionSummary,
+  UpdateGroupRequest,
+  WorktreeSummary,
+} from '@arboretum/shared';
+import { api, ApiError } from '../lib/api';
+import { wsClient, type GroupEvent } from '../lib/ws-client';
+import { useWorktreesStore } from './worktrees';
+
+/** Requête « feature cross-repo » : un worktree (et éventuellement une session) par repo. */
+export type CrossRepoRequest = Omit<CreateWorktreeRequest, 'path'>;
+
+/** Résultat par repo d'une action cross-repo (tolérance aux échecs partiels). */
+export interface CrossRepoResult {
+  repoId: string;
+  status: 'ok' | 'error';
+  message?: string;
+  worktreePath?: string;
+  sessionId?: string;
+}
+
+export const useGroupsStore = defineStore('groups', () => {
+  const groups = ref<GroupSummary[]>([]);
+  const selectedGroupId = ref<string | null>(null);
+  const loading = ref(false);
+  const loadError = ref<string | null>(null);
+  let unsubscribe: (() => void) | null = null;
+
+  function upsert(group: GroupSummary): void {
+    const idx = groups.value.findIndex((g) => g.id === group.id);
+    if (idx >= 0) groups.value.splice(idx, 1, group);
+    else groups.value.push(group);
+  }
+  function removeLocal(id: string): void {
+    groups.value = groups.value.filter((g) => g.id !== id);
+    if (selectedGroupId.value === id) selectedGroupId.value = null;
+  }
+  function onEvent(e: GroupEvent): void {
+    if (e.type === 'group_update') upsert(e.group);
+    else removeLocal(e.groupId);
+  }
+
+  function byId(id: string): GroupSummary | undefined {
+    return groups.value.find((g) => g.id === id);
+  }
+
+  // ---- getters dérivés : réutilisent le store worktrees par filtrage repoId (zéro refetch) ----
+  function reposInGroup(groupId: string): RepoSummary[] {
+    const g = byId(groupId);
+    if (!g) return [];
+    const wt = useWorktreesStore();
+    return g.repoIds
+      .map((id) => wt.repos.find((r) => r.id === id))
+      .filter((r): r is RepoSummary => r !== undefined);
+  }
+  function worktreesInGroup(groupId: string): WorktreeSummary[] {
+    const g = byId(groupId);
+    if (!g) return [];
+    const ids = new Set(g.repoIds);
+    return useWorktreesStore().worktrees.filter((w) => ids.has(w.repoId));
+  }
+  function sessionsInGroup(groupId: string): SessionSummary[] {
+    return worktreesInGroup(groupId).flatMap((w) => w.sessions);
+  }
+
+  async function fetchGroups(): Promise<void> {
+    loading.value = true;
+    loadError.value = null;
+    try {
+      const res = await api.get<GroupsListResponse>('/api/v1/groups');
+      groups.value = res.groups;
+    } catch (err) {
+      loadError.value = err instanceof Error ? err.message : String(err);
+    } finally {
+      loading.value = false;
+    }
+  }
+
+  async function createGroup(req: CreateGroupRequest): Promise<GroupSummary> {
+    const res = await api.post<GroupResponse>('/api/v1/groups', req);
+    upsert(res.group);
+    return res.group;
+  }
+  async function updateGroup(id: string, patch: UpdateGroupRequest): Promise<GroupSummary> {
+    const res = await api.patch<GroupResponse>(`/api/v1/groups/${id}`, patch);
+    upsert(res.group);
+    return res.group;
+  }
+  async function deleteGroup(id: string): Promise<void> {
+    await api.delete<{ ok: true }>(`/api/v1/groups/${id}`);
+    removeLocal(id);
+  }
+  async function addRepoToGroup(groupId: string, repoId: string): Promise<GroupSummary> {
+    const res = await api.post<GroupResponse>(`/api/v1/groups/${groupId}/repos`, { repoId });
+    upsert(res.group);
+    return res.group;
+  }
+  async function removeRepoFromGroup(groupId: string, repoId: string): Promise<GroupSummary> {
+    const res = await api.delete<GroupResponse>(`/api/v1/groups/${groupId}/repos/${repoId}`);
+    upsert(res.group);
+    return res.group;
+  }
+
+  /**
+   * Crée le même worktree (et éventuellement une session) dans chaque repo, en une action.
+   * Orchestration côté client : les worktrees sont indépendants entre repos, donc on tolère
+   * les échecs partiels (un repo en échec n'empêche pas les autres). Feedback par repo.
+   */
+  async function createCrossRepoFeature(
+    repoIds: string[],
+    req: CrossRepoRequest,
+    onProgress?: (result: CrossRepoResult) => void,
+  ): Promise<CrossRepoResult[]> {
+    const wt = useWorktreesStore();
+    return Promise.all(
+      repoIds.map(async (repoId): Promise<CrossRepoResult> => {
+        try {
+          const res = await wt.createWorktree(repoId, req);
+          const result: CrossRepoResult = {
+            repoId,
+            status: 'ok',
+            worktreePath: res.worktree.path,
+            ...(res.session ? { sessionId: res.session.id } : {}),
+          };
+          onProgress?.(result);
+          return result;
+        } catch (err) {
+          const result: CrossRepoResult = {
+            repoId,
+            status: 'error',
+            message: err instanceof ApiError ? err.message : err instanceof Error ? err.message : String(err),
+          };
+          onProgress?.(result);
+          return result;
+        }
+      }),
+    );
+  }
+
+  function startRealtime(): void {
+    unsubscribe ??= wsClient.subscribeGroups(onEvent);
+  }
+  function stopRealtime(): void {
+    unsubscribe?.();
+    unsubscribe = null;
+  }
+
+  return {
+    groups,
+    selectedGroupId,
+    loading,
+    loadError,
+    byId,
+    reposInGroup,
+    worktreesInGroup,
+    sessionsInGroup,
+    fetchGroups,
+    createGroup,
+    updateGroup,
+    deleteGroup,
+    addRepoToGroup,
+    removeRepoFromGroup,
+    createCrossRepoFeature,
+    startRealtime,
+    stopRealtime,
+  };
+});

packages/web/src/views/DashboardView.vue

@@ -5,6 +5,7 @@
         <h1 class="text-lg font-semibold text-zinc-100">{{ t('dashboard.title') }}</h1>
         <span v-if="auth.serverVersion" class="text-xs text-zinc-600">v{{ auth.serverVersion }}</span>
         <div class="ml-auto flex items-center gap-2">
+          <RouterLink :to="{ name: 'groups' }" class="btn">{{ t('dashboard.groups') }}</RouterLink>
           <RouterLink :to="{ name: 'sessions' }" class="btn">{{ t('dashboard.allSessions') }}</RouterLink>
           <button class="btn" :disabled="store.loading" @click="store.fetchAll()">{{ t('sessions.refresh') }}</button>
           <button

packages/web/src/views/GroupView.vue

@@ -0,0 +1,149 @@
+<template>
+  <div class="overflow-y-auto">
+    <div class="mx-auto flex max-w-3xl flex-col gap-4 px-4 py-6">
+      <header class="flex flex-wrap items-center gap-3">
+        <RouterLink :to="{ name: 'groups' }" class="text-sm text-zinc-400 hover:text-zinc-200">← {{ t('groups.title') }}</RouterLink>
+        <h1 v-if="group" class="flex items-center gap-2 text-lg font-semibold text-zinc-100">
+          <span class="h-3 w-3 rounded-full" :style="{ backgroundColor: group.color ?? '#52525b' }" />
+          {{ group.label }}
+        </h1>
+        <div class="ml-auto flex flex-wrap items-center gap-2">
+          <button v-if="group" class="btn text-xs" :class="editingRepos ? 'border-sky-700 text-sky-300' : ''" @click="editingRepos = !editingRepos">
+            {{ editingRepos ? t('groups.editDone') : t('groups.edit') }}
+          </button>
+          <button class="btn text-xs" :disabled="groupRepos.length === 0" @click="showFeatureModal = true">{{ t('groups.newFeature') }}</button>
+          <div class="flex overflow-hidden rounded border border-zinc-800">
+            <button class="px-2 py-1 text-xs" :class="view === 'list' ? 'bg-zinc-800 text-zinc-100' : 'text-zinc-400'" @click="view = 'list'">
+              {{ t('groups.viewList') }}
+            </button>
+            <button class="px-2 py-1 text-xs" :class="view === 'grid' ? 'bg-zinc-800 text-zinc-100' : 'text-zinc-400'" @click="view = 'grid'">
+              {{ t('groups.viewGrid') }}
+            </button>
+          </div>
+          <button class="btn text-xs" :disabled="worktrees.loading" @click="refresh">{{ t('sessions.refresh') }}</button>
+          <LanguageSwitcher />
+        </div>
+      </header>
+
+      <p v-if="!group" class="text-sm text-zinc-500">{{ t('common.loading') }}</p>
+
+      <template v-else>
+        <!-- édition de la composition : ajouter/retirer des repos déjà enregistrés -->
+        <div v-if="editingRepos" class="flex flex-col gap-1 rounded-lg border border-zinc-800 bg-zinc-900/50 p-3 text-xs text-zinc-400">
+          {{ t('groups.reposLabel') }}
+          <p v-if="worktrees.repos.length === 0" class="text-zinc-600">{{ t('groups.noReposRegistered') }}</p>
+          <div v-else class="flex flex-wrap gap-2">
+            <label
+              v-for="repo in worktrees.repos"
+              :key="repo.id"
+              class="flex items-center gap-1.5 rounded border border-zinc-800 bg-zinc-950/40 px-2 py-1"
+            >
+              <input type="checkbox" :checked="group.repoIds.includes(repo.id)" @change="toggleRepo(repo.id)" />
+              <span class="text-zinc-300">{{ repo.label }}</span>
+            </label>
+          </div>
+        </div>
+
+        <!-- mode liste : réutilise RepoSection (worktrees + sessions + dialogues inline) -->
+        <template v-if="view === 'list'">
+          <p v-if="groupRepos.length === 0 && missingRepoIds.length === 0" class="text-sm text-zinc-500">{{ t('groups.noReposInGroup') }}</p>
+          <RepoSection v-for="repo in groupRepos" :key="repo.id" :repo="repo" />
+          <div
+            v-for="id in missingRepoIds"
+            :key="id"
+            class="flex items-center gap-2 rounded-lg border border-amber-900/50 bg-amber-950/20 p-3 text-sm text-amber-300"
+          >
+            <span class="flex-1">{{ t('groups.missingRepo') }} <span class="font-mono text-xs text-amber-500/70">{{ id }}</span></span>
+            <button class="btn text-xs" @click="removeRepo(id)">{{ t('groups.removeFromGroup') }}</button>
+          </div>
+        </template>
+
+        <!-- mode grille : terminaux côte à côte -->
+        <TerminalGrid v-else :sessions="activeGroupSessions" />
+      </template>
+    </div>
+
+    <CrossRepoFeatureModal
+      v-if="showFeatureModal && group"
+      :repos="groupRepos"
+      @close="showFeatureModal = false"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed, onMounted, onUnmounted, ref } from 'vue';
+import { useRoute } from 'vue-router';
+import { useI18n } from 'vue-i18n';
+import type { SessionSummary } from '@arboretum/shared';
+import { useGroupsStore } from '../stores/groups';
+import { useWorktreesStore } from '../stores/worktrees';
+import { useSessionsStore } from '../stores/sessions';
+import LanguageSwitcher from '../components/LanguageSwitcher.vue';
+import RepoSection from '../components/RepoSection.vue';
+import TerminalGrid from '../components/TerminalGrid.vue';
+import CrossRepoFeatureModal from '../components/CrossRepoFeatureModal.vue';
+
+const { t } = useI18n();
+const route = useRoute();
+const groups = useGroupsStore();
+const worktrees = useWorktreesStore();
+const sessions = useSessionsStore();
+
+const groupId = computed(() => String(route.params.id));
+const group = computed(() => groups.byId(groupId.value));
+const view = ref<'list' | 'grid'>('list');
+const editingRepos = ref(false);
+const showFeatureModal = ref(false);
+
+const groupRepos = computed(() => groups.reposInGroup(groupId.value));
+
+// repoIds du groupe absents du store worktrees (repo supprimé mais membership pas encore purgée côté UI).
+const missingRepoIds = computed(() => {
+  const g = group.value;
+  if (!g) return [];
+  const known = new Set(worktrees.repos.map((r) => r.id));
+  return g.repoIds.filter((id) => !known.has(id));
+});
+
+// sessions vivantes et attachables des repos du groupe, en version live (store sessions).
+const activeGroupSessions = computed<SessionSummary[]>(() => {
+  const byId = new Map<string, SessionSummary>();
+  for (const snap of groups.sessionsInGroup(groupId.value)) {
+    const live = sessions.sessions.find((x) => x.id === snap.id) ?? snap;
+    if (live.live && live.attachable) byId.set(live.id, live);
+  }
+  return [...byId.values()];
+});
+
+onMounted(() => {
+  void groups.fetchGroups();
+  void worktrees.fetchAll();
+  void sessions.fetchSessions();
+  groups.startRealtime();
+  worktrees.startRealtime();
+  sessions.startRealtime();
+});
+
+onUnmounted(() => {
+  groups.stopRealtime();
+  worktrees.stopRealtime();
+  sessions.stopRealtime();
+});
+
+async function refresh(): Promise<void> {
+  await Promise.all([groups.fetchGroups(), worktrees.fetchAll(), sessions.fetchSessions()]);
+}
+
+async function toggleRepo(repoId: string): Promise<void> {
+  const g = group.value;
+  if (!g) return;
+  if (g.repoIds.includes(repoId)) await groups.removeRepoFromGroup(g.id, repoId);
+  else await groups.addRepoToGroup(g.id, repoId);
+}
+
+async function removeRepo(repoId: string): Promise<void> {
+  const g = group.value;
+  if (g) await groups.removeRepoFromGroup(g.id, repoId);
+}
+</script>

packages/web/src/views/GroupsListView.vue

@@ -0,0 +1,157 @@
+<template>
+  <div class="overflow-y-auto">
+    <div class="mx-auto flex max-w-3xl flex-col gap-4 px-4 py-6">
+      <header class="flex items-center gap-3">
+        <h1 class="text-lg font-semibold text-zinc-100">{{ t('groups.title') }}</h1>
+        <div class="ml-auto flex items-center gap-2">
+          <RouterLink :to="{ name: 'dashboard' }" class="btn">{{ t('groups.dashboard') }}</RouterLink>
+          <button class="btn" :disabled="groups.loading" @click="refresh">{{ t('sessions.refresh') }}</button>
+          <LanguageSwitcher />
+          <button class="btn" @click="onLogout">{{ t('common.logout') }}</button>
+        </div>
+      </header>
+
+      <!-- création d'un groupe : nom + sélection des repos déjà enregistrés -->
+      <form class="flex flex-col gap-2 rounded-lg border border-zinc-800 bg-zinc-900/50 p-3" @submit.prevent="onCreate">
+        <label class="flex flex-col gap-1 text-xs text-zinc-400">
+          {{ t('groups.nameLabel') }}
+          <input v-model="newLabel" type="text" class="input" :placeholder="t('groups.namePlaceholder')" required />
+        </label>
+        <div class="flex flex-col gap-1 text-xs text-zinc-400">
+          {{ t('groups.reposLabel') }}
+          <p v-if="worktrees.repos.length === 0" class="text-zinc-600">{{ t('groups.noReposRegistered') }}</p>
+          <div v-else class="flex flex-wrap gap-2">
+            <label
+              v-for="repo in worktrees.repos"
+              :key="repo.id"
+              class="flex items-center gap-1.5 rounded border border-zinc-800 bg-zinc-950/40 px-2 py-1"
+            >
+              <input v-model="selectedRepoIds" type="checkbox" :value="repo.id" />
+              <span class="text-zinc-300">{{ repo.label }}</span>
+            </label>
+          </div>
+        </div>
+        <div class="flex items-center gap-2">
+          <button type="submit" class="btn-primary" :disabled="creating || newLabel.trim() === ''">
+            {{ creating ? t('groups.creating') : t('groups.new') }}
+          </button>
+          <span v-if="createError" class="text-sm text-red-400">{{ createError }}</span>
+        </div>
+      </form>
+
+      <p v-if="groups.loadError" class="text-sm text-red-400">{{ groups.loadError }}</p>
+      <p v-else-if="groups.loading && groups.groups.length === 0" class="text-sm text-zinc-500">{{ t('common.loading') }}</p>
+      <p v-else-if="groups.groups.length === 0" class="text-sm text-zinc-500">{{ t('groups.empty') }}</p>
+
+      <div class="flex flex-col gap-2">
+        <article
+          v-for="group in groups.groups"
+          :key="group.id"
+          class="flex items-center gap-3 rounded-lg border border-zinc-800 bg-zinc-900/50 p-3"
+        >
+          <span
+            class="h-3 w-3 shrink-0 rounded-full"
+            :style="{ backgroundColor: group.color ?? '#52525b' }"
+          />
+          <div class="min-w-0 flex-1">
+            <RouterLink :to="{ name: 'group', params: { id: group.id } }" class="font-semibold text-zinc-100 hover:underline">
+              {{ group.label }}
+            </RouterLink>
+            <p v-if="group.description" class="truncate text-xs text-zinc-500">{{ group.description }}</p>
+          </div>
+          <span class="text-xs text-zinc-500">{{ t('groups.repoCount', group.repoIds.length) }}</span>
+          <span v-if="activeCount(group.id) > 0" class="badge bg-emerald-950 text-emerald-400">
+            {{ t('groups.sessionsActive', activeCount(group.id)) }}
+          </span>
+          <div class="flex items-center gap-2">
+            <RouterLink :to="{ name: 'group', params: { id: group.id } }" class="btn text-xs">{{ t('groups.open') }}</RouterLink>
+            <template v-if="confirmingDelete === group.id">
+              <button class="btn-danger text-xs" @click="onDelete(group.id)">{{ t('groups.confirmDelete') }}</button>
+              <button class="btn text-xs" @click="confirmingDelete = null">{{ t('common.cancel') }}</button>
+            </template>
+            <button v-else class="btn-danger text-xs" @click="confirmingDelete = group.id">{{ t('groups.remove') }}</button>
+          </div>
+        </article>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { onMounted, onUnmounted, ref } from 'vue';
+import { useRouter } from 'vue-router';
+import { useI18n } from 'vue-i18n';
+import { useAuthStore } from '../stores/auth';
+import { useGroupsStore } from '../stores/groups';
+import { useWorktreesStore } from '../stores/worktrees';
+import { useSessionsStore } from '../stores/sessions';
+import LanguageSwitcher from '../components/LanguageSwitcher.vue';
+
+const { t } = useI18n();
+const router = useRouter();
+const auth = useAuthStore();
+const groups = useGroupsStore();
+const worktrees = useWorktreesStore();
+const sessions = useSessionsStore();
+
+const newLabel = ref('');
+const selectedRepoIds = ref<string[]>([]);
+const creating = ref(false);
+const createError = ref<string | null>(null);
+const confirmingDelete = ref<string | null>(null);
+
+// nombre de sessions vivantes corrélées aux repos du groupe (badge d'aperçu).
+function activeCount(groupId: string): number {
+  return groups.sessionsInGroup(groupId).filter((s) => s.live).length;
+}
+
+onMounted(() => {
+  void groups.fetchGroups();
+  void worktrees.fetchAll();
+  void sessions.fetchSessions();
+  groups.startRealtime();
+  worktrees.startRealtime();
+  sessions.startRealtime();
+});
+
+onUnmounted(() => {
+  groups.stopRealtime();
+  worktrees.stopRealtime();
+  sessions.stopRealtime();
+});
+
+async function refresh(): Promise<void> {
+  await Promise.all([groups.fetchGroups(), worktrees.fetchAll(), sessions.fetchSessions()]);
+}
+
+async function onCreate(): Promise<void> {
+  creating.value = true;
+  createError.value = null;
+  try {
+    await groups.createGroup({ label: newLabel.value.trim(), repoIds: [...selectedRepoIds.value] });
+    newLabel.value = '';
+    selectedRepoIds.value = [];
+  } catch (err) {
+    createError.value = err instanceof Error ? err.message : String(err);
+  } finally {
+    creating.value = false;
+  }
+}
+
+async function onDelete(id: string): Promise<void> {
+  confirmingDelete.value = null;
+  try {
+    await groups.deleteGroup(id);
+  } catch (err) {
+    createError.value = err instanceof Error ? err.message : String(err);
+  }
+}
+
+async function onLogout(): Promise<void> {
+  groups.stopRealtime();
+  worktrees.stopRealtime();
+  sessions.stopRealtime();
+  await auth.logout();
+  await router.replace({ name: 'login' });
+}
+</script>