[chat]Persist chatbot state in local storage

[wanglam]

Description

This change introduces persistent state management for the chatbot window using browser localStorage. The implementation extends the ChatService to track comprehensive window state including open/closed status, layout mode (sidecar or fullscreen), and padding size, automatically persisting changes to localStorage and restoring the chatbot to its previous configuration on application start.

Changelog

• feat: Persist chatbot state in local storage

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

❌ Patch coverage is 74.07407% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.76%. Comparing base (a2d096f) to head (5f3a0fb).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...gins/chat/public/components/chat_header_button.tsx	46.66%	5 Missing and 3 partials ⚠️
src/plugins/chat/public/services/chat_service.ts	77.77%	3 Missing and 1 partial ⚠️
src/plugins/chat/public/plugin.ts	90.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10895   +/-   ##
=======================================
  Coverage   60.76%   60.76%           
=======================================
  Files        4533     4533           
  Lines      122127   122162   +35     
  Branches    20459    20469   +10     
=======================================
+ Hits        74207    74232   +25     
- Misses      42687    42693    +6     
- Partials     5233     5237    +4     

Flag	Coverage Δ
Linux_1	26.57% <ø> (+<0.01%)	⬆️
Linux_2	38.92% <ø> (-0.01%)	⬇️
Linux_3	39.43% <74.07%> (+0.01%)	⬆️
Linux_4	33.75% <ø> (+<0.01%)	⬆️
Windows_1	26.58% <ø> (+<0.01%)	⬆️
Windows_2	38.90% <ø> (-0.01%)	⬇️
Windows_3	39.44% <74.07%> (+0.01%)	⬆️
Windows_4	33.75% <ø> (+<0.01%)	⬆️

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[d-buckner]

How are we handling invalidation if a user logs out and signs in to another user? Or are we thinking about these preferences as client preferences instead of user preferences?

[wanglam]

How are we handling invalidation if a user logs out and signs in to another user? Or are we thinking about these preferences as client preferences instead of user preferences?

Yes. For now it's a client preferences. It won't be cleared after user logout. This is an existing feature in the dashboards assistant repo. I just sync back to the OSD chat plugin to keep the two chatbot have the same behavior.