feat(status): built-in and custom status presets

The Status Message field required typing every status from scratch. Add
a one-click preset row:

- Built-in "Quick statuses" spanning gaming, social, life and work
  (Gaming, In a party, Ranked grind, AFK, Watching, In a meeting,
  Working remotely, Lunch, On vacation, Out sick...), each carrying a
  suggested auto-clear so a click sets the message and the timer at once.
- Custom presets: save the current status as a reusable preset, stored
  in io.lotus.status_presets account data (synced across devices via the
  shared account-data list store), de-duped by normalized label, capped
  at 20, deletable inline.

The existing save path is factored into a shared applyStatus() used by
the Save button and by preset apply, so server writes, the status
localStorage keys, and the auto-clear expiry bookkeeping stay identical.
Ordering/de-dupe logic is pure in utils/statusPresets.ts (upsertPreset,
normalizeLabel) with unit tests; no change to the presence wire format,
expiry monitor, or presence-mode selector.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/utils/statusPresets.test.ts

@@ -0,0 +1,52 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { upsertPreset, normalizeLabel, StatusPreset } from './statusPresets';
+
+const p = (id: string, label: string, clearAfter = '0'): StatusPreset => ({ id, label, clearAfter });
+
+test('normalizeLabel trims and lowercases', () => {
+  assert.equal(normalizeLabel('  🎮 Gaming  '), '🎮 gaming');
+  assert.equal(normalizeLabel('AFK'), 'afk');
+});
+
+test('upsertPreset prepends a new preset', () => {
+  const list = [p('1', 'a'), p('2', 'b')];
+  const out = upsertPreset(list, p('3', 'c'));
+  assert.deepEqual(
+    out.map((x) => x.id),
+    ['3', '1', '2'],
+  );
+});
+
+test('upsertPreset de-dupes by normalized label, moving the entry to the front', () => {
+  const list = [p('1', 'Gaming'), p('2', 'b'), p('3', 'c')];
+  // Same label (different case/whitespace) → old entry removed, new one at front.
+  const out = upsertPreset(list, p('9', '  gaming '));
+  assert.deepEqual(
+    out.map((x) => x.id),
+    ['9', '2', '3'],
+  );
+  assert.equal(out.filter((x) => normalizeLabel(x.label) === 'gaming').length, 1);
+});
+
+test('upsertPreset enforces the cap, dropping the oldest', () => {
+  const list = Array.from({ length: 20 }, (_, i) => p(String(i), `label-${i}`));
+  const out = upsertPreset(list, p('new', 'fresh'), 20);
+  assert.equal(out.length, 20);
+  assert.equal(out[0].id, 'new');
+  // The last (oldest) entry, id '19', is dropped.
+  assert.equal(
+    out.some((x) => x.id === '19'),
+    false,
+  );
+});
+
+test('upsertPreset does not mutate its input', () => {
+  const list = [p('1', 'a'), p('2', 'b')];
+  const before = list.map((x) => x.id);
+  upsertPreset(list, p('3', 'c'));
+  assert.deepEqual(
+    list.map((x) => x.id),
+    before,
+  );
+});