feat(US-1109): tabbed settings panel redesign

- Vertical sidebar navigation with 7 tabs: General, Board, Tasks, Agents, Data, Notifications, Manage
- Toggle rows with Switch components + descriptive labels
- Number inputs with min/max validation and unit labels
- Auto-save with debounced 500ms updates + save indicator
- Reset to Defaults button per section with confirmation
- Mobile: tabs collapse to dropdown selector
- Keyboard navigation between tabs (arrow keys)
- Existing managed lists (task types, projects, sprints, templates) moved to Manage tab

.veritas-kanban/telemetry/events-2026-01-28.ndjson

@@ -376,3 +376,7 @@
 {"type":"task.status_changed","taskId":"task_20260128_iG-ISb","project":"platform","status":"in-progress","previousStatus":"todo","id":"evt_ksH0_KoAniP_","timestamp":"2026-01-28T08:13:40.507Z"}
 {"type":"task.status_changed","taskId":"task_20260128_X6nifI","project":"veritas-kanban","status":"in-progress","previousStatus":"todo","id":"evt_odb919zCXAY_","timestamp":"2026-01-28T08:13:54.704Z"}
 {"type":"task.status_changed","taskId":"task_20260128_XvmMga","project":"brain","status":"done","previousStatus":"in-progress","id":"evt_jnEvHTbJxLMW","timestamp":"2026-01-28T08:15:54.946Z"}
+{"type":"task.status_changed","taskId":"task_20260128_X6nifI","project":"veritas-kanban","status":"done","previousStatus":"in-progress","id":"evt_YajbhOKzUsOY","timestamp":"2026-01-28T08:16:32.285Z"}
+{"type":"task.status_changed","taskId":"task_20260128_gUHeIV","project":"veritas-kanban","status":"done","previousStatus":"todo","id":"evt_G9eTdXe2ODgX","timestamp":"2026-01-28T08:16:32.375Z"}
+{"type":"task.status_changed","taskId":"task_20260128_KbDn0E","project":"veritas-kanban","status":"in-progress","previousStatus":"todo","id":"evt_6RFeSMLm9ozB","timestamp":"2026-01-28T08:16:32.436Z"}
+{"type":"task.created","taskId":"task_20260128_8KRThU","project":"veritas-kanban","status":"todo","id":"evt_HYsNYmQp-M1h","timestamp":"2026-01-28T08:16:39.653Z"}

server/.veritas-kanban/activity.json

@@ -1,4 +1,71 @@
 [
+  {
+    "id": "activity_1769588199653_whhfki2dz",
+    "type": "task_created",
+    "taskId": "task_20260128_8KRThU",
+    "taskTitle": "FEATURE REQUEST: Change Review Column to Blocked",
+    "details": {
+      "type": "feature-request-n30mhV",
+      "priority": "medium",
+      "project": "veritas-kanban"
+    },
+    "timestamp": "2026-01-28T08:16:39.653Z"
+  },
+  {
+    "id": "activity_1769588192436_i9tzea6mk",
+    "type": "status_changed",
+    "taskId": "task_20260128_KbDn0E",
+    "taskTitle": "US-1109: Settings UI — Tabbed panel redesign",
+    "details": {
+      "from": "todo",
+      "status": "in-progress"
+    },
+    "timestamp": "2026-01-28T08:16:32.436Z"
+  },
+  {
+    "id": "activity_1769588192387_wjoormah7",
+    "type": "comment_added",
+    "taskId": "task_20260128_gUHeIV",
+    "taskTitle": "US-1102: Feature toggle React context & hooks",
+    "details": {
+      "author": "Veritas",
+      "preview": "useFeatureSettings, useFeatureSetting, useUpdateFe..."
+    },
+    "timestamp": "2026-01-28T08:16:32.387Z"
+  },
+  {
+    "id": "activity_1769588192375_z068olrt4",
+    "type": "status_changed",
+    "taskId": "task_20260128_gUHeIV",
+    "taskTitle": "US-1102: Feature toggle React context & hooks",
+    "details": {
+      "from": "todo",
+      "status": "done"
+    },
+    "timestamp": "2026-01-28T08:16:32.375Z"
+  },
+  {
+    "id": "activity_1769588192354_kmcif9395",
+    "type": "comment_added",
+    "taskId": "task_20260128_X6nifI",
+    "taskTitle": "US-1101: Settings infrastructure & config schema expansion",
+    "details": {
+      "author": "Veritas",
+      "preview": "FeatureSettings types + defaults, deep merge in Co..."
+    },
+    "timestamp": "2026-01-28T08:16:32.354Z"
+  },
+  {
+    "id": "activity_1769588192286_615p4w08r",
+    "type": "status_changed",
+    "taskId": "task_20260128_X6nifI",
+    "taskTitle": "US-1101: Settings infrastructure & config schema expansion",
+    "details": {
+      "from": "in-progress",
+      "status": "done"
+    },
+    "timestamp": "2026-01-28T08:16:32.286Z"
+  },
   {
     "id": "activity_1769588154981_unig8oz3f",
     "type": "comment_added",