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/components/NewSession.tsx

@@ -169,6 +169,7 @@ export function NewSession({ onMenu, onCreated }: { onMenu: () => void; onCreate
   // Folder: a new one (name) inside a root, or an existing one (picked).
   const [folderMode, setFolderMode] = useState<"new" | "existing" | "git">("new");
   const [repoUrl, setRepoUrl] = useState("");
+  const [isolated, setIsolated] = useState(false);
   // Original software (zip, tar.gz, installer …) for the recreate workflow, uploaded in chunks.
   const [originals, setOriginals] = useState<File[]>([]);
   const [progress, setProgress] = useState<Record<string, number>>({});
@@ -323,6 +324,10 @@ export function NewSession({ onMenu, onCreated }: { onMenu: () => void; onCreate
         agent: task === "cad" ? "build" : task,
         clean_room: isCraft ? !deep : undefined,
       });
+      if (isolated && folderMode !== "new") {
+        setCreating(t("worktree.creating"));
+        await post(`/sessions/${s.id}/worktree`, { action: "create" });
+      }
       const msgs = prompts(uploaded).filter((m) => m.trim());
       for (const [i, m] of msgs.entries()) await post(`/sessions/${s.id}/prompt`, { text: m, images: i === 0 ? images : [] });
       onCreated(s.id);
@@ -547,6 +552,15 @@ export function NewSession({ onMenu, onCreated }: { onMenu: () => void; onCreate
                 </div>
               )}
               {folderMode === "existing" && <FolderPicker path={picked} onPick={setPicked} />}
+              {folderMode !== "new" && (
+                <label className="wiz-check-row">
+                  <input type="checkbox" checked={isolated} onChange={(e) => setIsolated(e.target.checked)} />
+                  <span>
+                    <b>{t("worktree.isolate")}</b>
+                    <span className="hint"> – {t("worktree.isolateHint")}</span>
+                  </span>
+                </label>
+              )}
               {error && <div className="notice err">{error}</div>}
               <div className="wiz-start-row">
                 <button className="primary wiz-start" disabled={!canStart} onClick={create}>