fix(ui): use correct theme color for unread indicator button

[xsahil03x]

Fixes: #2366

Description of the pull request

The unread indicator button's text and close icon were previously hardcoded to white. This commit updates them to use colorTheme.barsBg from the current theme, ensuring they adapt correctly to different themes.

Summary by CodeRabbit

• Bug Fixes

  • Unread indicator now respects app theme: the unread count label and close icon use the theme’s bars background color instead of a hardcoded white, improving visibility and consistency across light, dark, and custom themes.

• Documentation

  • Changelog updated to document the UI theming fix for the unread indicator button.

[coderabbitai]

Walkthrough

Updated UnreadIndicatorButton to use StreamColorTheme's barsBg for text and icon colors instead of hardcoded white; updated CHANGELOG to record the theming fix referencing issue #2366. No API or control-flow changes.

Changes

Cohort / File(s)	Summary
Theming update: UnreadIndicatorButton packages/stream_chat_flutter/lib/src/message_list_view/unread_indicator_button.dart	Replaced hardcoded Colors.white with colorTheme.barsBg for unread count text and close icon foreground. No logic changes.
Changelog packages/stream_chat_flutter/CHANGELOG.md	Added changelog entry noting the unread indicator button now uses colorTheme.barsBg; references #2366.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• renefloor

Poem

I thump with joy—no blinding white!
A softer hue now paints the night.
BarsBg sings where icons gleam,
The unread badge joins the theme.
In code we nibble, neat and tight—🥕✨

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "fix(ui): use correct theme color for unread indicator button" is a concise, single-sentence summary that directly describes the primary change (replacing hard-coded white with the theme color for the unread indicator), so it accurately and clearly reflects the PR's main intent.
Linked Issues Check	✅ Passed	The PR replaces hard-coded white with colorTheme.barsBg in unread_indicator_button.dart and updates the changelog, which directly satisfies issue #2366's requirement that the UnreadIndicatorButton use StreamColorTheme.barsBg so it respects theming; no linked-issue coding requirements remain unmet based on the provided summaries.
Out of Scope Changes Check	✅ Passed	All shown modifications are limited to the unread indicator widget and the package changelog and are related to theming the unread indicator as specified in issue #2366; there are no unrelated or out-of-scope code changes in the provided summaries.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/unread-indicator-button-theming

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📥 Commits

Reviewing files that changed from the base of the PR and between 3978c79 and b6d9e3e.

📒 Files selected for processing (1)

• packages/stream_chat_flutter/CHANGELOG.md (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• packages/stream_chat_flutter/CHANGELOG.md

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (10)

• GitHub Check: build (ios)
• GitHub Check: analyze
• GitHub Check: build (android)
• GitHub Check: test
• GitHub Check: analyze_legacy_versions
• GitHub Check: stream_chat_localizations
• GitHub Check: stream_chat_flutter
• GitHub Check: stream_chat_flutter_core
• GitHub Check: stream_chat
• GitHub Check: stream_chat_persistence

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.81%. Comparing base (70c0f7e) to head (b6d9e3e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...src/message_list_view/unread_indicator_button.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2382      +/-   ##
==========================================
- Coverage   63.81%   63.81%   -0.01%     
==========================================
  Files         413      413              
  Lines       25837    25838       +1     
==========================================
  Hits        16488    16488              
- Misses       9349     9350       +1     

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