feat(voice): hero TimerHomeWidget + timer cancel/adjust by label

UI:
- Replace Notes column on Home bento with TimerHomeWidget. Shows all
  active timers as stacked cards with big 30px countdowns, per-timer
  +1/-1 minute buttons and cancel. Colors: indigo default, amber in
  last 10s, red when expired. Empty state suggests voice command.
- Existing chip TimerWidget (bottom-right) kept for ambient view on
  other tabs — redundant on Home, but harmless.

API:
- /api/voice/timer accepts cookie OR bearer (browser widget cancel
  works with user's auth_token cookie; Python script uses bearer).
- New action 'adjust' — shifts endsAt by delta_seconds. Clamps so
  endsAt never goes into the past.
- Cancel now supports {label} in addition to {id} (fuzzy substring
  match, most-recently-started wins). Emits timer_cancel with id+label
  so clients can refresh.
- findByLabel / adjustTimer helpers in lib/timers.ts.

lib/timers.ts

@@ -7,8 +7,8 @@ const TIMERS_PATH = path.join(DATA_DIR, 'tablet-timers.json')
 export interface Timer {
   id: string
   label: string
-  startedAt: string // ISO
-  endsAt: string    // ISO
+  startedAt: string
+  endsAt: string
   agent?: 'cosmo' | 'lusya'
 }
 
@@ -27,11 +27,14 @@ function save(list: Timer[]) {
   } catch {}
 }
 
-// Mutative helpers, used by timer API route
+function cleanup(list: Timer[]): Timer[] {
+  // Drop items expired more than 30 min ago
+  const cutoff = Date.now() - 30 * 60 * 1000
+  return list.filter(t => new Date(t.endsAt).getTime() > cutoff)
+}
+
 export function listActive(): Timer[] {
-  const now = Date.now()
-  // Drop any that expired over 30 min ago — stale garbage
-  const list = load().filter(t => new Date(t.endsAt).getTime() > now - 30 * 60 * 1000)
+  const list = cleanup(load())
   save(list)
   return list
 }
@@ -42,16 +45,49 @@ export function addTimer(t: Omit<Timer, 'id' | 'startedAt'>): Timer {
     startedAt: new Date().toISOString(),
     ...t,
   }
-  const list = load()
+  const list = cleanup(load())
   list.push(full)
   save(list)
   return full
 }
 
-export function removeTimer(id: string): boolean {
+export function removeTimer(id: string): Timer | null {
   const list = load()
-  const next = list.filter(t => t.id !== id)
-  if (next.length === list.length) return false
-  save(next)
-  return true
+  const found = list.find(t => t.id === id)
+  if (!found) return null
+  save(list.filter(t => t.id !== id))
+  return found
+}
+
+/**
+ * Fuzzy lookup by label (case-insensitive substring match).
+ * Returns most-recently-started matching active timer, or null.
+ */
+export function findByLabel(label: string): Timer | null {
+  const q = label.trim().toLowerCase()
+  if (!q) return null
+  const list = listActive()
+  const matches = list.filter(t =>
+    t.label.toLowerCase().includes(q) || q.includes(t.label.toLowerCase())
+  )
+  if (matches.length === 0) return null
+  // Sort by startedAt desc — most recent wins
+  matches.sort((a, b) => new Date(b.startedAt).getTime() - new Date(a.startedAt).getTime())
+  return matches[0]
+}
+
+/**
+ * Shift endsAt by deltaSeconds. Returns updated timer or null if not found.
+ * Clamps endsAt to no earlier than "now + 1s" (не даём в прошлое).
+ */
+export function adjustTimer(id: string, deltaSeconds: number): Timer | null {
+  const list = load()
+  const idx = list.findIndex(t => t.id === id)
+  if (idx === -1) return null
+  const current = new Date(list[idx].endsAt).getTime()
+  const proposed = current + deltaSeconds * 1000
+  const minimum = Date.now() + 1000
+  list[idx] = { ...list[idx], endsAt: new Date(Math.max(proposed, minimum)).toISOString() }
+  save(list)
+  return list[idx]
 }