implement status icon blinking

[lidaobing]

TODO

• send message should not trigger blinking
• open chat window should clear the blinking state
• config window should be optimized

Summary by Sourcery

Add blinking behavior to the status icon when in blinking mode and unread messages are present, and stop blinking when the window becomes active.

New Features:

• Introduce a blinking status icon mode that alternates between normal and reverse icons for unread messages on macOS and Linux.
• Automatically stop the blinking status icon when the application window becomes active.

Enhancements:

• Ensure timers and icon resources for status indicators are properly cleaned up when indicators are destroyed or modes change.

[sourcery-ai]

Hey - I've left some high level feedback:

• The blink timer management logic is duplicated between AppIndicatorMac.mm and AppIndicator.cpp; consider extracting a small shared helper (or at least a common pattern/utility) so the behavior stays in sync and is easier to maintain.
• For managing blinkTimerId, consider using the GLib helper pattern (e.g., g_clear_handle_id-style logic) to ensure the ID is always cleared in a single place and to make repeated start/stop calls safer and less error-prone.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The blink timer management logic is duplicated between AppIndicatorMac.mm and AppIndicator.cpp; consider extracting a small shared helper (or at least a common pattern/utility) so the behavior stays in sync and is easier to maintain.
- For managing blinkTimerId, consider using the GLib helper pattern (e.g., g_clear_handle_id-style logic) to ensure the ID is always cleared in a single place and to make repeated start/stop calls safer and less error-prone.

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[github-actions]

Test Results

69 tests  ±0   69 ✅ ±0   3s ⏱️ ±0s
32 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 2090617. ± Comparison against base commit 60cd410.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 26.96629% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.75%. Comparing base (60cd410) to head (2090617).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/iptux/AppIndicator.cpp	0.00%	48 Missing ⚠️
src/iptux/DialogBase.cpp	12.50%	7 Missing ⚠️
src/iptux/MainWindow.cpp	0.00%	5 Missing ⚠️
src/iptux/Application.cpp	0.00%	4 Missing ⚠️
src/iptux/UiModels.cpp	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
- Coverage   52.11%   51.75%   -0.36%     
==========================================
  Files          64       64              
  Lines        8641     8704      +63     
==========================================
+ Hits         4503     4505       +2     
- Misses       4138     4199      +61     

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