EAS build config + Collaboration UI + i18n updates

- eas.json for Android APK/AAB + iOS builds
- Collaboration page: assign, transfer, claim, subtasks
- Task detail: assignee avatars, subtask progress
- Updated translations (cs,he,ru,ua)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/messages/cs.json

@@ -152,5 +152,33 @@
   },
   "forgotPassword": {
     "description": "Obnova hesla bude brzy k dispozici."
+  },
+  "collab": {
+    "title": "Spoluprace",
+    "assignees": "Prirazeni uzivatele",
+    "noAssignees": "Nikdo neni prirazen",
+    "assign": "Priradit",
+    "transfer": "Predat",
+    "claim": "Prevzit",
+    "searchUser": "Hledat uzivatele...",
+    "transferMessage": "Zprava k predani...",
+    "subtasks": "Podukoly",
+    "noSubtasks": "Zadne podukoly",
+    "subtaskTitle": "Nazev podukolu...",
+    "assignSubtask": "Priradit podukol (volitelne)...",
+    "addSubtask": "Pridat podukol",
+    "addBtn": "Pridat",
+    "history": "Historie spoluprace",
+    "noHistory": "Zadna historie",
+    "assigned": "priradil/a",
+    "transferred": "predal/a",
+    "claimed": "prevzal/a",
+    "collaborated": "spolupracuje",
+    "system": "System",
+    "statusAccepted": "Prijato",
+    "statusRejected": "Odmitnuto",
+    "statusPending": "Ceka",
+    "subtasksDone": "podukolu hotovo",
+    "collaboration": "Spoluprace"
   }
-}
+}