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/Regenerate.tsx

@@ -0,0 +1,62 @@
+import { useState } from "react";
+import { post } from "../api";
+import { useT } from "../i18n";
+import { toast } from "../dialogs";
+import { Icon } from "./Icon";
+import { ModelSelect } from "./ModelSelect";
+
+export const EFFORTS = ["low", "medium", "high", "max"] as const;
+
+/** Effort choice for one turn ("" = the model's default). */
+export function EffortSelect({ value, onChange, compact }: { value: string; onChange: (v: string) => void; compact?: boolean }) {
+  const t = useT();
+  return (
+    <select className={compact ? "effort-select" : ""} value={value} onChange={(e) => onChange(e.target.value)} title={t("effort.title")} aria-label={t("effort.title")}>
+      <option value="">{compact ? t("effort.autoShort") : t("effort.auto")}</option>
+      {EFFORTS.map((e) => (
+        <option key={e} value={e}>
+          {t(`effort.${e}` as any)}
+        </option>
+      ))}
+    </select>
+  );
+}
+
+/** Redo the last turn, optionally with another model and effort. */
+export function RegenerateButton({ sessionId, messageId, model }: { sessionId: string; messageId: string; model: string }) {
+  const t = useT();
+  const [open, setOpen] = useState(false);
+  const [m, setM] = useState(model);
+  const [effort, setEffort] = useState("");
+  const [busy, setBusy] = useState(false);
+  const go = async () => {
+    setBusy(true);
+    try {
+      await post(`/sessions/${sessionId}/regenerate`, { message_id: messageId, model: m !== model ? m : undefined, effort: effort || undefined });
+      setOpen(false);
+    } catch (e: any) {
+      toast(e.message);
+    } finally {
+      setBusy(false);
+    }
+  };
+  return (
+    <div className="regen">
+      <button className="small ghost" onClick={() => setOpen(!open)} title={t("regen.title")}>
+        <Icon name="refresh" /> {t("regen.button")}
+      </button>
+      {open && (
+        <div className="regen-panel">
+          <div className="hint">{t("regen.hint")}</div>
+          <div className="row" style={{ gap: 6, flexWrap: "wrap" }}>
+            <ModelSelect value={m} onChange={setM} />
+            <EffortSelect value={effort} onChange={setEffort} />
+            <button className="small primary" disabled={busy} onClick={go}>
+              <Icon name="refresh" /> {t("regen.go")}
+            </button>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}