Add worktrees, per-hunk review, effort per message, regenerate, voice input

- Isolated git worktree per session (create, status, merge, discard)
- Permission card: accept file-edit hunks individually; agent learns what was rejected
- Reasoning effort per message; regenerate the last answer with another model/effort
- Voice input via the Web Speech API
- Folder-up button in the file browser; ssh, rsync and mc in the image

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/types.ts

@@ -60,6 +60,8 @@ export interface Session {
   clean_room?: boolean | null;
   /** Craft workflow phase reported by the agent. */
   phase?: string;
+  /** Isolated git worktree of the session. */
+  worktree?: { repo: string; path: string; branch: string; base: string; sub?: string } | null;
   /** Listed because it was shared with the current user. */
   shared?: boolean;
 }