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/styles.css

@@ -1555,6 +1555,18 @@ a.button.small {
   font-size: 12.5px;
   color: var(--muted);
   word-break: break-all;
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 2px;
+}
+.crumbs-up {
+  margin-right: 6px;
+  padding: 3px 8px;
+}
+.crumbs-up .icon {
+  width: 18px;
+  height: 18px;
 }
 .entries {
   flex: 1;
@@ -2942,3 +2954,89 @@ button.danger-solid {
 .chip.ok {
   color: var(--green);
 }
+
+/* --- worktree ------------------------------------------------------------------- */
+.wt-wrap {
+  position: relative;
+}
+.wt-chip {
+  border: 1px solid var(--accent);
+  color: var(--accent);
+  cursor: pointer;
+}
+.wt-panel {
+  width: 340px;
+  padding: 12px;
+  gap: 6px;
+}
+.wt-stats {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px;
+  font-size: 13px;
+}
+.wt-log {
+  font-size: 12px;
+  background: var(--bg0);
+  padding: 6px 8px;
+  border-radius: 6px;
+  max-height: 140px;
+  overflow: auto;
+  margin: 0;
+}
+.menu-pop-body a .icon {
+  margin-right: 6px;
+}
+.wiz-check-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+}
+
+/* --- per-hunk review ----------------------------------------------------------- */
+.hunk-block {
+  border-top: 1px dashed var(--bg3);
+}
+.hunk-block.off > div {
+  opacity: 0.35;
+  text-decoration: line-through;
+}
+.hunk-head {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+  color: var(--blue);
+  background: var(--bg1);
+  padding: 2px 6px;
+}
+
+/* --- regenerate / effort --------------------------------------------------------- */
+.regen {
+  margin-top: 6px;
+}
+.regen > button {
+  opacity: 0.7;
+}
+.regen > button:hover {
+  opacity: 1;
+}
+.regen-panel {
+  margin-top: 6px;
+  padding: 10px;
+  border: 1px solid var(--bg3);
+  border-radius: var(--radius);
+  background: var(--bg1);
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+.effort-select {
+  max-width: 150px;
+}
+
+.voice-btn.on {
+  color: var(--red);
+  animation: glow 1.2s ease-in-out infinite;
+}