Merge remote-tracking branch 'upstream/develop' into feature/scroll-to-unread-messages

Resolved conflicts:
- libraries/matrix/impl/.../fakes/FakeFfiSpaceRoomList.kt: took upstream's
  direct return for rooms() — the simulateLongTask wrapper is for IO-style
  operations like paginate/reset, not a quick read.
- libraries/ui-strings/src/main/res/values/temporary.xml: kept the file with
  only the live strings (action_mark_as_read, a11y_jump_to_unread_messages).
  Dropped common_black (upstream moved theme strings to module-local R.string)
  and a11y_jump_to_unread_messages_count (badge count was removed earlier).
- RoomInfo.kt and its fixtures/tests: took upstream's version since both
  branches independently added fullyReadEventId via the same SDK bump
  (matrix-rust-components-kotlin 26.05.20).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -93,27 +93,13 @@ enum class FeatureFlags(
         defaultValue = { false },
         isFinished = false,
     ),
-    SignInWithClassic(
-        key = "feature.signin_with_classic",
-        title = "Sign in with Element Classic",
-        description = "Allow the application to sign in to the current Element Classic account.",
-        defaultValue = { false },
-        isFinished = false,
-    ),
     AllowBlackTheme(
         key = "feature.allow_black_theme",
-        title = "Allow black theme",
+        title = "Black theme",
         description = "Allow selecting the black appearance theme for battery saving on OLED.",
         defaultValue = { false },
         isFinished = false,
     ),
-    LiveLocationSharing(
-        key = "feature.liveLocationSharing",
-        title = "Live location sharing",
-        description = "Allow sharing live location in rooms.",
-        defaultValue = { false },
-        isFinished = false,
-    ),
     ValidateNetworkWhenSchedulingNotificationFetching(
         key = "feature.validate_network_when_scheduling_notification_fetching",
         title = "Validate internet connectivity when scheduling notification fetching",