**Category:** new-feature
**User Impact:** Mobile users can copy permalinks, revisit, follow, and
manage messages through a clearer long-press menu that matches desktop
capabilities.
**Problem:** The mobile message menu exposed only a small subset of
desktop actions, and important workflows such as copying a permalink or
scheduling a reminder were unavailable or hard to discover.
**Solution:** Bring applicable desktop actions to mobile using native
patterns, promote Reply, Copy link, and Remind me above the fold, and
group the remaining actions by intent in a scrollable sheet.
**Intentional behavior changes (per review):**
- The quick-reaction row goes from 6 emojis to 4 (👀 and 🙏 dropped) to
make room for larger 52px tap targets alongside the `+` picker, which
still offers the full set.
- **Copy link — not a native share sheet — is the permalink path.** An
earlier revision shipped a `share_plus` Share message row; it was
removed in review since Copy link covers the job and custom-scheme
`buzz://` URIs are handled inconsistently by share targets. Native share
can return as a follow-up with an https fallback.
- Mark unread is message-scoped and session-local: it forces just that
message unread (surfacing its channel as unread), and message-level Mark
read can never clear a channel-level unread set from the channel tile.
<details>
<summary>File changes</summary>
**mobile/lib/features/channels/channels_provider.dart**
Feeds followed thread roots into unread and notification evaluation so
following a thread has meaningful behavior.
**mobile/lib/features/channels/message_actions.dart**
Reworks the long-press sheet with promoted fast actions, message links,
reminders, read state, thread following, and clearer action grouping
while preserving existing guards. Quick-reaction circles share one
extracted widget.
**mobile/lib/features/channels/read_state/message_read_state.dart**
Centralizes message-level unread evaluation across channel, message, and
thread markers; channel-level forced unread deliberately does not leak
into message state.
**mobile/lib/features/channels/read_state/read_state_provider.dart**
Forced-unread flags are per-context (channel id or `msg:` key) mapped to
their channel, so message- and channel-level unread choices round-trip
independently.
**mobile/lib/features/channels/thread_follows/thread_follows_provider.dart**
Exposes per-identity thread follow state to the message menu and
notification pipeline.
**mobile/lib/features/channels/thread_follows/thread_follows_storage.dart**
Persists a bounded, validated set of followed thread roots on the
device.
**mobile/lib/shared/reminders/remind_me_later_sheet.dart**
Adds reminder presets and a native custom date/time flow for deferring a
message. Lives under `shared/` so the channels feature never imports
another feature module. Cancelling the custom picker keeps the preset
sheet open; submission failures show stable copy and log the underlying
error.
**mobile/lib/shared/reminders/reminder_service.dart**
Creates desktop-compatible, self-encrypted kind-30300 reminder events.
**mobile/lib/shared/reminders/reminder_time_presets.dart**
Defines reminder choices that match the desktop experience.
**mobile/lib/shared/deeplink/deep_link.dart**
Builds canonical Buzz message links, including thread context when
present.
**mobile/lib/shared/relay/nostr_models.dart**
Adds the reminder event kind to the shared Nostr model constants.
**mobile/lib/shared/widgets/sheet_divider.dart**
Shared bottom-sheet section divider used by the message actions and
reminder sheets.
**mobile/test/features/channels/message_actions_test.dart**
Covers action visibility and guards, promoted actions, read/unread
round-tripping (including channel- vs message-level force isolation),
thread follows, and canonical links.
**mobile/test/features/channels/read_state/message_read_state_test.dart**
Covers unread precedence for channel, message, and thread contexts.
**mobile/test/features/channels/thread_follows/thread_follows_storage_test.dart**
Covers follow persistence, identity separation, validation, and storage
bounds.
**mobile/test/shared/reminders/reminder_service_test.dart**
Covers reminder payloads, tags, crypto round-tripping, and preset
behavior.
**mobile/test/features/channels/read_state/read_state_provider_test.dart**
Drives the production ReadStateNotifier/ReadStateManager (no fake
bookkeeping) through message unread → read → unread round-trips,
explicit channel-level Mark read clearing forced messages, and automatic
channel-open reads preserving them.
**mobile/test/shared/reminders/remind_me_later_sheet_test.dart**
Covers custom-picker cancel keeping the sheet open, stable failure copy
without the raw error, and the happy preset path.
**mobile/test/shared/deeplink/deep_link_test.dart**
Covers canonical top-level and threaded message-link generation.
</details>
## Reproduction steps
1. Run the mobile app with a signed-in identity and open a channel
containing regular messages and threads.
2. Long-press a message and confirm reactions plus Reply, Copy link, and
Remind me appear as fast actions above the fold.
3. Use Copy link; confirm the resulting `buzz://message` link opens the
correct channel and thread context.
4. Toggle Mark unread/Mark read and Follow thread/Unfollow thread,
reopening the sheet to confirm each state changes correctly. Force a
channel unread from the channel tile, then mark a message read — the
channel stays unread.
5. Choose a reminder preset and a custom date/time; confirm the reminder
is created and appears in the desktop reminder experience. Cancel the
custom date picker and confirm the reminder sheet stays open.
6. Long-press a system message and a message you cannot manage; confirm
utility and destructive actions remain appropriately hidden.
## Screenshots / demos
<img width="1206" height="2622" alt="image"
src="https://github.com/user-attachments/assets/81096cd6-329b-408f-bcff-712e23b268a4"
/>
---------
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>
Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz>
