feat(desktop): information architecture overhaul — home, records, meetings first

Wave 2 of the 2026-09-28 design overhaul ("records are the main
character, a quiet instrument"). Decisions: design.md.

- Shell: sidebar with primary Home / Records / Meetings (Ctrl+1..3) and a
  secondary "Tools" group; every item is a button with aria-current.
  The status bar is removed — its "100% LOCAL PRIVACY · ZERO CLOUD SYNC"
  claim contradicted device sync; the sidebar shows only queried state.
- Navigation context (routes, params, back, useRouteRequest) so Home can
  open a specific meeting or record.
- Home replaces the dashboard: dictation key, start actions, only real
  problems, one-line summary, recent records and meetings, file
  transcription, free-tier limits.
- Settings become a full-screen route with vertical tabs (tabs no longer
  clip) and a shared row grammar; long-standing bugs fixed: team and
  enterprise tiers crashed the license tab (currentTier undefined),
  first-run onboarding could not be left, Pro+ saw "upgrade to Pro+".
- Records: date-grouped single list with in-place expansion, search and
  tags together, mode/favorite filters, load more past 50, undoable
  delete. Meetings: list with search/rename/delete, summary-first detail
  (summary | transcript | documents | my notes), notes persisted locally
  instead of being lost. Tools pages cleaned up; stale-closure example
  chips and a 1550x mouse-distance bug fixed.
- Shared pieces: PageHeader, EmptyStateCard, SearchInput ("/" works),
  ConfirmDialog, notify with undo; display-labels maps domain values to
  typed i18n keys so missing keys fail to compile.
- Mono font stack falls back to Pretendard for Hangul (Korean labels no
  longer render spaced out).
- i18n: new ko/en keys via scripts/i18n-add-keys.mjs (one read-merge-
  write so parallel editors cannot clobber locale files).

Some renderer files also carried pre-existing in-flight changes (error
recovery deep links, meeting document hooks); they are included as-is.

scripts/i18n-add-keys.mjs

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+// scripts/i18n-add-keys.mjs
+// 번역 키를 ko/en(필요하면 다른 로케일) JSON 에 한 번에 병합한다. 파일 전체를 읽고-합치고-쓰는 동작이 한 프로세스 안에서
+// 끝나므로, 여러 작업자가 같은 로케일 파일을 손으로 Edit 하다 서로 덮어쓰는 일을 막는다.
+//
+// 사용: node scripts/i18n-add-keys.mjs <keys.json>
+//   keys.json 형식: { "ko": { "home.title": "오늘" }, "en": { "home.title": "Today" } }
+//   이미 있는 키는 값을 바꾼다(--no-overwrite 면 건너뛴다). 새 키는 파일 끝에 붙는다.
+
+import { readFileSync, writeFileSync, renameSync } from 'node:fs'
+import { dirname, join } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const here = dirname(fileURLToPath(import.meta.url))
+const localesDir = join(here, '..', 'packages', 'i18n', 'src', 'locales')
+
+const [input, flag] = process.argv.slice(2)
+if (!input) {
+  process.stderr.write('usage: node scripts/i18n-add-keys.mjs <keys.json> [--no-overwrite]\n')
+  process.exit(2)
+}
+const overwrite = flag !== '--no-overwrite'
+const patch = JSON.parse(readFileSync(input, 'utf8'))
+
+let changed = 0
+for (const [locale, entries] of Object.entries(patch)) {
+  const file = join(localesDir, `${locale}.json`)
+  const current = JSON.parse(readFileSync(file, 'utf8'))
+  for (const [key, value] of Object.entries(entries)) {
+    if (typeof value !== 'string') throw new Error(`${locale}.${key}: value must be a string`)
+    if (key in current && !overwrite) continue
+    if (current[key] !== value) {
+      current[key] = value
+      changed++
+    }
+  }
+  const tmp = `${file}.tmp-${process.pid}`
+  writeFileSync(tmp, `${JSON.stringify(current, null, 2)}\n`, 'utf8')
+  renameSync(tmp, file)
+}
+process.stdout.write(`i18n: ${changed} key(s) written\n`)