docs(site): refléter le démarrage sur la branche principale ou tout worktree

Met à jour la copie « Worktree-first » et l'étape « How it works » : on peut
désormais démarrer une session sur sa branche principale ou un worktree isolé.

packages/site/src/i18n/en.ts

@@ -17,7 +17,7 @@ export default {
   featKicker: 'Everything in one view',
   featTitle: 'Built to supervise agents — not to be an IDE',
   feat1Title: 'Worktree-first',
-  feat1Desc: 'Every session is pinned to a git worktree. You see branches, not chaos.',
+  feat1Desc: 'Work on your main branch or spin up an isolated worktree — every session stays pinned to a branch. Branches, not chaos.',
   feat2Title: 'Many sessions, one view',
   feat2Desc: 'Run parallel Claude Code agents side by side in a single live grid.',
   feat3Title: 'Fine-grained states',
@@ -56,7 +56,7 @@ export default {
   step2Title: 'Open the dashboard',
   step2Desc: 'It serves a web dashboard on localhost. Install it as a PWA on any device.',
   step3Title: 'Spawn & supervise',
-  step3Desc: 'Start Claude Code sessions on any worktree and watch them from anywhere.',
+  step3Desc: 'Start Claude Code sessions on your main branch or any worktree, and watch them from anywhere.',
   secKicker: 'Security',
   secTitle: 'A web terminal you can actually trust',
   secIntro: 'Built local-first. Nothing is exposed unless you choose to — and even then, on your terms.',