feat(site): showcase IDE workspace, diff/staging et services git distants

- WorkspaceShowcase.vue : maquette fidèle de la vue /workspace (arbre de
  fichiers + panneau commit staging/amend + diff coloré + terminal corrélé).
- RemoteGitSection.vue : connexions GitHub/GitLab/Gitea (chiffrées at-rest)
  + barre de progression de clone.
- 5 cartes features, pilier sécurité « Encrypted secrets », 3 FAQ, ancre nav.
- i18n EN/FR à parité ; meta description orientée IDE. Bump 0.2.0.

packages/site/index.html

@@ -9,7 +9,7 @@
     <title>Arboretum — Mission control for your AI coding agents</title>
     <meta
       name="description"
-      content="Arboretum is a local-first daemon you launch with npx that serves a web dashboard to run and supervise many Claude Code sessions across git worktrees — from any device, even your phone."
+      content="Arboretum is a local-first daemon you launch with npx that serves a web IDE to run and supervise many Claude Code sessions across git worktrees — edit files, diff, stage and commit, connect git services, all from any device, even your phone."
     />
     <link rel="canonical" href="https://git-arboretum.com/" />
 
@@ -19,7 +19,7 @@
     <meta property="og:title" content="Arboretum — Mission control for your AI coding agents" />
     <meta
       property="og:description"
-      content="Run and supervise many Claude Code sessions across every git worktree — from any device, even your phone."
+      content="Run and supervise many Claude Code sessions across every git worktree — a browser IDE to edit, diff, commit and clone, from any device, even your phone."
     />
     <meta property="og:site_name" content="Arboretum" />
     <meta property="og:image" content="https://git-arboretum.com/assets/og-cover.png" />
@@ -30,7 +30,7 @@
     <meta name="twitter:title" content="Arboretum — Mission control for your AI coding agents" />
     <meta
       name="twitter:description"
-      content="Run and supervise many Claude Code sessions across every git worktree — from any device, even your phone."
+      content="Run and supervise many Claude Code sessions across every git worktree — a browser IDE to edit, diff, commit and clone, from any device, even your phone."
     />
     <meta name="twitter:image" content="https://git-arboretum.com/assets/og-cover.png" />