chore(repo): bump min Flutter to 3.44.0 and Dart SDK to 3.12.0

[xsahil03x]

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Linear: FLU-694

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Description of the pull request

Flutter 3.47.0 went stable on 2026-08-12, so the SDK's "minimum supported = latest stable − 1" policy makes Flutter 3.44.0 / Dart 3.12.0 the new floor (up from 3.41.0 / 3.11.0).

This is Track B (floor raise) only — Track A ("support Flutter 3.47") already landed in #2882. Following #2721/#2108/#2068, a floor raise is not marked breaking: existing code keeps compiling, older SDKs simply stop resolving the new version, and the CHANGELOG bullets go under 🔄 Changed.

What changed

• Three version knobs, in lockstep: melos.yaml (source of truth), .fvmrc, and legacy_version_analyze.yml's flutter_version — the last set to the new floor, since that job is the floor's regression test.
• 13 pubspecs + the root workspace + pubspec.lock. stream_chat is pure Dart and correctly carries no flutter constraint.
• prefer_initializing_formals on ~29 previously-silent sites. Raising the Dart constraint raises each package's language version, and Dart 3.12 legalised this._privateField as a named parameter — so the lint's suggested fix only became expressible now. Zero violations before, ~29 after; none of it caused by the new stable, all of it by the floor. Applied via dart fix --apply --code=prefer_initializing_formals.
• CHANGELOG bullet in all five packages (stream_chat's mentions the Dart SDK only).

Manual review of the dart fix pass

dart fix is mechanical, not thoughtful, so the refactor was re-audited against current master:

• No doc comment was rewritten or deleted (git diff -- '*.dart' | grep -E "^[-+]\s*(///|//)" is empty — checking only added lines would miss deletions).
• No public parameter renamed. Every introduced this._foo traces to a removed _foo = foo;. Assignments whose names differ or carry a default — _provider = tokenProvider, _locationProvider = locationProvider ?? LocationProvider() — were correctly left alone.

Testing

Check	Result
dart analyze --fatal-infos, 7 packages @ 3.44.0 (new floor)	clean
same @ 3.47.0 (what CI's analyze job resolves to)	clean
dart format, 1004 tracked files, both toolchains	0 changed
stream_chat / _core / _persistence / _localizations tests	1624 / 362 / 302 / 23 passed
stream_chat_flutter goldens (CI=true)	40 failed — identical set to master

On the 40 golden failures: these are the pre-existing macOS-vs-Linux baseline (committed goldens are Linux-rendered). origin/master was bootstrapped in a throwaway worktree under the same 3.44.0 toolchain and the failure sets diffed — comm returns empty in both directions, 40 shared. Zero introduced, so no goldens were regenerated and update_goldens.yml was not dispatched. No .png is touched by this diff.

Not verified locally: the build (android) and build (ios) matrix jobs — this PR's own CI run is the check there. Since this is a floor raise and not a new-stable adoption, no Gradle/AGP/Kotlin/Xcode floors move.

Out of scope (pre-existing, noted for follow-up)

• avoid_null_checks_in_equality_operators in the root analysis_options.yaml reports deprecated_lint on both 3.44 and 3.47. Pre-existing debt, not introduced here — but cheaper to delete now than to hit as a hard undefined_lint failure two releases later. Worth a small follow-up PR.
• melos bootstrap strips a stale jni entry from two example generated_plugins.cmake files (dead since media_kit's removal in fix(ui): Removed mediakit dependency from sdk #2828). Confirmed pre-existing — master's CI is green — so it is deliberately left out of this PR.

Screenshots / Videos

Not applicable — no user-visible behaviour or rendering changes.

🤖 Generated with Claude Code

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