feat(desktop): two-way cloud sync with mobile and web

Rewrites the desktop mirror as services/sync/SyncEngine: a persistent
outbox, per-account server-clock keyset cursors with paging, pulls that never
overwrite unsent local edits, deletions both ways through sync_tombstones and
per-row failure isolation. It now covers history titles and favorites,
dictionary, every meeting's memos and documents, memo tags, user commands and
dictation/meeting templates, and registers the desktop as a device that the
phone can disconnect.

Fixes shipped defects: the first pull after sign-in fetched nothing, only
the first meeting's children were pushed, team meetings leaked into the
personal database and lost team_id on re-push, and Realtime never connected
because Electron's Node 20 has no global WebSocket (ws is now the transport).
Anonymous local-mode records are imported into the first account that signs
in. The settings sync section is translated and shows pending/rejected
changes; synced screens reload on app:dataChanged.

package-lock.json

@@ -137,7 +137,8 @@
         "react-markdown": "^10.1.0",
         "remark-gfm": "^4.0.1",
         "tar": "^7.5.13",
-        "uiohook-napi": "^1.5.5"
+        "uiohook-napi": "^1.5.5",
+        "ws": "^8.22.0"
       },
       "devDependencies": {
         "@electron-toolkit/tsconfig": "^1.0.1",
@@ -146,6 +147,7 @@
         "@types/node": "^22.13.0",
         "@types/react": "^19.0.0",
         "@types/react-dom": "^19.0.0",
+        "@types/ws": "^8.18.1",
         "@vitejs/plugin-react": "^4.3.0",
         "electron": "33.4.11",
         "electron-builder": "^26.8.1",
@@ -17031,9 +17033,9 @@
       "license": "ISC"
     },
     "node_modules/ws": {
-      "version": "8.21.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
-      "integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
+      "version": "8.22.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.22.0.tgz",
+      "integrity": "sha512-Ydggc987+RO0AnWtZ/7Wq9FtNvcrL1b/RO0ud9mWjUPgDrsAAwQSF51sm2hm1XofbU/4jkpGEsLFsZZxU+1DOg==",
       "license": "MIT",
       "engines": {
         "node": ">=10.0.0"