feat: отправка вложений — файлы, опросы и геопозиция

- FILE/POLL/LOCATION через MSG_SEND (opcode 64) с inline-attach
  - sendLocationMessage / sendPollMessage в MessagesModule
  - экран создания опроса + рабочие вкладки «Файл/Геопозиция/Опрос» в шторке
  - geolocator + разрешения геолокации (Android/iOS) для текущей позиции

pubspec.lock

@@ -533,6 +533,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.12.12+hotfix.1"
+  geolocator:
+    dependency: "direct main"
+    description:
+      name: geolocator
+      sha256: f62bcd90459e63210bbf9c35deb6a51c521f992a78de19a1fe5c11704f9530e2
+      url: "https://pub.dev"
+    source: hosted
+    version: "13.0.4"
+  geolocator_android:
+    dependency: transitive
+    description:
+      name: geolocator_android
+      sha256: fcb1760a50d7500deca37c9a666785c047139b5f9ee15aa5469fae7dbbe3170d
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.6.2"
+  geolocator_apple:
+    dependency: transitive
+    description:
+      name: geolocator_apple
+      sha256: dbdd8789d5aaf14cf69f74d4925ad1336b4433a6efdf2fce91e8955dc921bf22
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.13"
+  geolocator_platform_interface:
+    dependency: transitive
+    description:
+      name: geolocator_platform_interface
+      sha256: dde05dae7d584db6e82feb87dd9fb0b4b4c83ed68065667b4bef637be38e13a7
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.2.7"
+  geolocator_web:
+    dependency: transitive
+    description:
+      name: geolocator_web
+      sha256: b1ae9bdfd90f861fde8fd4f209c37b953d65e92823cb73c7dee1fa021b06f172
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.3"
+  geolocator_windows:
+    dependency: transitive
+    description:
+      name: geolocator_windows
+      sha256: "175435404d20278ffd220de83c2ca293b73db95eafbdc8131fe8609be1421eb6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.5"
   glob:
     dependency: transitive
     description: