Feature/convo v3 pt2

[ThomasSession]

More features for our compose conversation v3

[Copilot]

Pull request overview

This PR continues the Compose-based “Conversation v3” rollout by adding a Paging-backed conversation list, refactoring message rendering into grouped content blocks, and introducing a new mention/link formatting pipeline plus a debug-only v2/v3 switch.

Changes:

• Added Paging 3 + LazyPagingItems to render conversation items (messages, date breaks, unread marker) in Compose.
• Refactored message UI into MessageViewData + MessageContentGroup/MessageContentData and added/updated message content composables (quote/link/media/audio/document/community invite/control).
• Introduced MessageTextFormatter + MessageText for mention/link annotations and mention pill background rendering; added debug app-bar action to switch between v2 and v3.

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
gradle/libs.versions.toml	Adds Paging library version entries.
app/build.gradle.kts	Adds Paging dependencies for v3 conversation list.
app/src/main/java/org/thoughtcrime/securesms/ui/theme/Dimensions.kt	Adds maxMessageWidth used to cap message width on larger screens.
app/src/main/java/org/thoughtcrime/securesms/ui/components/ConversationAppBar.kt	Adds debug-only action to switch conversation version; updates API signature.
app/src/main/java/org/thoughtcrime/securesms/onboarding/landing/Landing.kt	Updates onboarding preview bubble rendering to new v3 message model.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageText.kt	New rich text composable for mentions + optional link handling + mention pill background.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageQuote.kt	Moves into .message package and updates to new quote/message model + MessageText.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageMedia.kt	Updates media rendering API to new message model and updates previews.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageLink.kt	Moves into .message package and updates previews/content wiring.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageEmojiReactions.kt	Renames expand/show-less callbacks to clearer names and updates call sites.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageEffects.kt	Minor refactor of highlight drawing implementation (Paint import).
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/DocumentMessage.kt	Refactors document UI/data model to fit new message content model.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/ControlMessage.kt	Adds control message composable for centered/system-style messages.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/CommunityInviteMessage.kt	Adds community invite message UI.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/BaseMessage.kt	Major refactor: message layout selection, grouped content rendering, new data model types.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/AudioMessage.kt	Refactors audio UI/data model to fit new message content model.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/conversation/ConversationScreen.kt	New Compose conversation screen using Paging + reverse layout.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/conversation/ConversationElements.kt	Adds date break + unread marker composables.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/ConversationScreen.kt	Removes old placeholder v3 conversation screen.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/MessageTextFormatter.kt	New formatter producing AnnotatedString link + mention annotations (UI-agnostic).
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/ConversationV3ViewModel.kt	Adds Paging-backed conversation items flow + invalidation on DB change notifications.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/ConversationV3NavHost.kt	Wires v3 screen move + exposes switchConvoVersion callback.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/ConversationPagingSource.kt	New paging source reading conversation records and mapping to UI items.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/ConversationDataMapper.kt	New mapper from DB records to ConversationItem + v3 message view-data model.
app/src/main/java/org/thoughtcrime/securesms/conversation/v3/ConversationActivityV3.kt	Adds v3→v2 switching behavior on request.
app/src/main/java/org/thoughtcrime/securesms/conversation/v2/utilities/TextUtilities.kt	Removes unused helper methods.
app/src/main/java/org/thoughtcrime/securesms/conversation/v2/utilities/MentionUtilities.kt	Extracts a shared mention parse/substitute core for reuse by v3 formatter.
app/src/main/java/org/thoughtcrime/securesms/conversation/v2/messages/QuoteView.kt	Adjusts quote author text style.
app/src/main/java/org/thoughtcrime/securesms/conversation/v2/ConversationActivityV2.kt	Adds v2→v3 switching behavior via app bar.

Comments suppressed due to low confidence (2)

app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/BaseMessage.kt:281

• MessageText is always given a non-null onUrlClick here, which enables underlined/clickable link rendering, but the handler is currently a no-op. This creates a UX where links look interactive but do nothing. Until link handling is implemented, pass onUrlClick = null (to strip link annotations) or wire it to the actual URL-opening behavior.
  app/src/main/java/org/thoughtcrime/securesms/conversation/v3/compose/message/MessageMedia.kt:55
• loading is passed into MediaMessage but is not used anywhere in the composable. If the overall loading state is no longer needed, remove the parameter; otherwise, use it to drive UI (e.g., overlay/progress) so callers aren’t forced to provide a value that has no effect.

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