feat: add chat-header feature to sliding container

[Wallgau]

• Adds the chat header component with session management capabilities to the playground sliding container.
  Changes
  -> Add ChatHeader component with title, actions, and session dropdown
  -> Add ChatSidebar component for session list in fullscreen mode
  -> Add SessionSelector component with rename and delete functionality
  -> Add SessionLogsModal for inspecting session messages
  -> Add session rename API integration with optimistic updates
  -> Extract session management logic into useSessionManagement hook
  -> Add tests for ChatSidebar component

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✨ Finishing touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/chat-header-feature

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	15.68% (4397/28032)	8.85% (1888/21330)	9.76% (602/6168)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
1693	0 💤	0 ❌	0 🔥	21.681s ⏱️

[codecov]

Codecov Report

❌ Patch coverage is 32.60341% with 277 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (feat/sliding-container-infrastructure@87e8f8f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...r/components/session-selector/session-selector.tsx	0.00%	52 Missing ⚠️
...hat-view/chat-header/components/session-rename.tsx	0.00%	43 Missing ⚠️
...omponent/chat-view/hooks/use-session-management.ts	0.00%	39 Missing ⚠️
...ntainer/components/flow-page-sliding-container.tsx	0.00%	32 Missing ⚠️
.../chat-header/components/chat-sessions-dropdown.tsx	0.00%	31 Missing ⚠️
...-view/chat-header/components/session-more-menu.tsx	47.22%	11 Missing and 8 partials ⚠️
...t-view/chat-header/hooks/use-chat-header-rename.ts	44.82%	16 Missing ⚠️
...groundComponent/chat-view/hooks/use-get-flow-id.ts	0.00%	10 Missing ⚠️
...view/chat-header/components/session-logs-modal.tsx	0.00%	9 Missing ⚠️
...at-header/hooks/use-chat-header-session-actions.ts	61.53%	5 Missing ⚠️
... and 8 more

Additional details and impacted files

@@                           Coverage Diff                            @@
##             feat/sliding-container-infrastructure   #10797   +/-   ##
========================================================================
  Coverage                                         ?   32.42%           
========================================================================
  Files                                            ?     1393           
  Lines                                            ?    63923           
  Branches                                         ?     9494           
========================================================================
  Hits                                             ?    20726           
  Misses                                           ?    42144           
  Partials                                         ?     1053           

Flag	Coverage Δ
frontend	14.52% <32.60%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...t/chat-view/chat-header/components/chat-header.tsx	100.00% <100.00%> (ø)
...t/chat-view/chat-header/utils/get-session-title.ts	100.00% <100.00%> (ø)
...w/chat-header/components/session-selector/index.ts	0.00% <0.00%> (ø)
...playgroundComponent/chat-view/chat-header/index.ts	0.00% <0.00%> (ø)
src/frontend/src/pages/FlowPage/index.tsx	0.00% <0.00%> (ø)
...iew/chat-header/components/chat-header-actions.tsx	86.66% <86.66%> (ø)
...-view/chat-header/components/chat-header-title.tsx	81.25% <81.25%> (ø)
.../chat-view/chat-header/components/chat-sidebar.tsx	88.23% <88.23%> (ø)
src/frontend/src/stores/messagesStore.ts	80.39% <0.00%> (ø)
...at-header/hooks/use-chat-header-session-actions.ts	61.53% <61.53%> (ø)
... and 10 more

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