Enhance PhotoViewer with share and open-in actions, improve reply UI

This commit introduces "Share" and "Open in..." actions to the `PhotoViewScreen`, allowing users to share images via other apps or open them in external viewers.

**Key changes:**

- **PhotoViewer:**
    - Added "Share" and "Open in..." options to the `PhotoViewScreen` dropdown menu.
    - `PhotoViewViewModel`:
        - Implemented `onShareClicked()` and `onOpenInClicked()` to handle these new actions.
        - Added `shareRequest` StateFlow to manage image sharing intents.
        - Introduced `downloadAndStoreImageToCache()` to download and cache images for sharing.
        - `onImageShared()` resets `shareRequest` after sharing.
    - Updated `TopBar` to include the new menu items.
    - Added string resources for "Open in…" and "Share".
- **Reply UI:**
    - `Reply.kt`: Title and summary text now use `TextOverflow.Ellipsis` to prevent long text from breaking the layout.
- **API Model:**
    - `MessagesResponse.kt`: Added `MessagesMarkAsImportantResponse` data class to handle the response for marking messages as important.
- **Data Layer:**
    - `MessagesRepositoryImpl`: Updated `markAsImportant` to correctly map the API response using `MessagesMarkAsImportantResponse`.
- **Minor:**
    - `README.md`: Updated feature checklist for external viewer.
    - `ApplicationModule.kt`: Added experimental Coil API opt-in.

core/data/src/main/kotlin/dev/meloda/fast/data/api/messages/MessagesRepositoryImpl.kt

@@ -320,7 +320,12 @@ class MessagesRepositoryImpl(
             messagesIds = messageIds.orEmpty(),
             important = important
         )
-        messagesService.markAsImportant(requestModel.map).mapApiDefault()
+        messagesService.markAsImportant(requestModel.map).mapApiResult(
+            successMapper = { apiResponse ->
+                apiResponse.requireResponse().marked.map { it.cmId }
+            },
+            errorMapper = { error -> error?.toDomain() }
+        )
     }
 
     override suspend fun delete(

core/model/src/main/kotlin/dev/meloda/fast/model/api/responses/MessagesResponse.kt

@@ -58,3 +58,15 @@ data class MessagesSendResponse(
     @Json(name = "message_id") val messageId: Long,
     @Json(name = "cmid") val cmId: Long
 )
+
+@JsonClass(generateAdapter = true)
+data class MessagesMarkAsImportantResponse(
+    @Json(name = "marked") val marked: List<Mark>
+) {
+    @JsonClass(generateAdapter = true)
+    data class Mark(
+        @Json(name = "cmid") val cmId: Long,
+        @Json(name = "message_id") val messageId: Long,
+        @Json(name = "peer_id") val peerId: Long
+    )
+}

core/network/src/main/kotlin/dev/meloda/fast/network/service/messages/MessagesService.kt

@@ -9,6 +9,7 @@ import dev.meloda.fast.model.api.responses.MessagesGetByIdResponse
 import dev.meloda.fast.model.api.responses.MessagesGetConversationMembersResponse
 import dev.meloda.fast.model.api.responses.MessagesGetHistoryAttachmentsResponse
 import dev.meloda.fast.model.api.responses.MessagesGetHistoryResponse
+import dev.meloda.fast.model.api.responses.MessagesMarkAsImportantResponse
 import dev.meloda.fast.model.api.responses.MessagesSendResponse
 import dev.meloda.fast.network.ApiResponse
 import dev.meloda.fast.network.RestApiError
@@ -76,7 +77,7 @@ interface MessagesService {
     @POST(MessagesUrls.MARK_AS_IMPORTANT)
     suspend fun markAsImportant(
         @FieldMap params: Map<String, String>
-    ): ApiResult<ApiResponse<List<Long>>, RestApiError>
+    ): ApiResult<ApiResponse<MessagesMarkAsImportantResponse>, RestApiError>
 
     @FormUrlEncoded
     @POST(MessagesUrls.DELETE)

core/ui/src/main/res/values-ru/strings.xml

@@ -277,4 +277,6 @@
     <string name="action_copy_link">Скопировать ссылку</string>
     <string name="action_copy">Скопировать</string>
     <string name="action_copy_image">Скопировать изображение</string>
+    <string name="action_open_in">Открыть в…</string>
+    <string name="action_share">Поделиться</string>
 </resources>

core/ui/src/main/res/values/strings.xml

@@ -354,4 +354,6 @@
     <string name="action_copy_link">Copy link</string>
     <string name="action_copy">Copy</string>
     <string name="action_copy_image">Copy image</string>
+    <string name="action_open_in">Open in…</string>
+    <string name="action_share">Share</string>
 </resources>