fix(llc): keep Channel.memberCount fresh from channel events, make primitive value streams distinct

[xsahil03x]

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Description of the pull request

Backports two llc changes from master to v9, one commit each. They are ordered: the second rewrites the memberCountStream test the first adds.

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1. Keep Channel.memberCount fresh from channel events

Backport of 9610ce2 (originally #2933).

Channel.memberCount / memberCountStream only ever reflected the member_count returned by query / watch and channel.updated. The member.added / member.removed handlers update the loaded member list but leave the count untouched, so it went stale for the rest of the session as soon as anyone joined or left. The handlers are byte-for-byte identical from 3.0.0 onwards, so this is not a regression.

The backend already ships the authoritative count as channel_member_count event metadata on channel events, next to the channel_message_count we already consume. This adds Event.channelMemberCount, applies it to ChannelModel.memberCount, and folds both counters into a single _listenChannelCounts listener so an event carrying both produces one state update.

Port notes

• event.g.dart hand-edited, not regenerated. Master's generated output uses Dart 3.10 null-aware map elements ('key': ?instance.x), which v9's sdk: ^3.6.2 rejects. The two added lines follow v9's existing if (instance.x case final value?) form, matching the adjacent channel_message_count entry.
• Formatting. Master formats at 120 cols, v9 at the 80-col default, so the ported test hunks were rewrapped.
• Serialization tests. Master's commit did not touch event_test.dart / test/fixtures/event.json. Extended here for channel_member_count, following what fix(llc): update watcher count from realtime events and ignore events after dispose #2898 did for watcher_count on this branch.

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2. Make primitive value streams distinct

Backport of 5dce4c9 (originally #2935).

Channel and ClientState getters that map to a single primitive value emitted on every channel-state / current-user update, even when the value was unchanged — pushing four distinct message counts through messageCountStream produced 13 emissions, and memberCountStream fired on every new message.

Those getters now .distinct(), matching the stream getters in channel.dart that already do (ownCapabilitiesStream, messagesStream, draftStream, …). Scope is primitives only (bool, int, String?, DateTime?); model and collection streams are untouched. All 19 call sites from the master change are present on v9 and were ported.

Port notes

• Master drops a redundant distinct() in stream_message_composer.dart, which does not exist on v9. The equivalent line lives in stream_message_input.dart:615 and covers the same two-arm switch; verified that both ChannelClientState.draftStream and threadDraftStream already dedupe on v9, so dropping it is a no-op here too.
• Master's changelog bullet for the Dart SDK floor raise is master-only and was not brought over.

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Verification

• melos run format — clean (0 changed).
• melos run analyze — no issues in any package.
• stream_chat: 1333 pass, 2 skipped, 0 fail.
• stream_chat_flutter_core: 231 pass.
• stream_chat_flutter (CI=true): 824 pass, 20 fail — all golden variants in avatars/gradient_avatar_test.dart, pre-existing local-vs-CI rendering drift unrelated to these changes.

Screenshots / Videos

No UI changes.

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[codecov]

Codecov Report

❌ Patch coverage is 26.53061% with 36 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v9@ec0963b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
packages/stream_chat/lib/src/client/channel.dart	29.26%	29 Missing ⚠️
packages/stream_chat/lib/src/client/client.dart	0.00%	6 Missing ⚠️
...er/lib/src/message_input/stream_message_input.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             v9    #2936   +/-   ##
=====================================
  Coverage      ?   67.41%           
=====================================
  Files         ?      431           
  Lines         ?    27444           
  Branches      ?        0           
=====================================
  Hits          ?    18500           
  Misses        ?     8944           
  Partials      ?        0           

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