fix: adjusted textarea and playground paddings and design

[lucaseduoli]

This pull request introduces improvements to the chat input and sliding container components in the frontend, focusing on better UI responsiveness and layout consistency. The main changes include adding a resize observer for the chat input textarea, adjusting styling for text elements, and modifying container layouts to enhance usability.

Enhancements to chat input responsiveness:

• src/frontend/src/components/core/playgroundComponent/chat-view/chat-input/components/text-area-wrapper.tsx: Added a ResizeObserver to dynamically resize the textarea when its container width changes, improving the input experience.

UI and layout adjustments:

• src/frontend/src/components/ui/textarea.tsx: Changed the wrapper div for the textarea from w-full to h-full w-full and removed the !max-h-fit class, ensuring the textarea expands properly within its container.
• src/frontend/src/components/core/playgroundComponent/chat-view/chat-input/components/no-input.tsx: Added the text-sm class to the muted foreground paragraph for more consistent font sizing.
• src/frontend/src/components/core/playgroundComponent/sliding-container/components/flow-page-sliding-container.tsx: Removed padding from the StickToBottom.Content container to streamline the layout.

Previous playground and prompt:

Playground and prompt after fixes:

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Walkthrough

The changes modify chat input components and layout styling. A ResizeObserver was added to detect textarea width changes and trigger dynamic height adjustment. CSS classes were adjusted to refine text sizing, remove padding constraints, and restructure the textarea wrapper layout.

Changes

Cohort / File(s)	Summary
Chat Input Components src/.../chat-input/components/no-input.tsx, src/.../chat-input/components/text-area-wrapper.tsx, src/frontend/src/components/ui/textarea.tsx	Added ResizeObserver to detect width-triggered textarea resizing with ref tracking; applied text-sm styling class to placeholder element; restructured textarea wrapper with height constraints.
Layout Container src/.../sliding-container/components/flow-page-sliding-container.tsx	Removed padding from StickToBottom.Content wrapper.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 3

❌ Failed checks (1 error, 2 warnings)

Check name	Status	Explanation	Resolution
Test Coverage For New Implementations	❌ Error	PR introduces new ResizeObserver functionality and layout modifications without corresponding test coverage. While test infrastructure exists, new features lack tests.	Add tests for ResizeObserver implementation, layout wrapper changes, and verify CSS class additions in existing tests.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Test Quality And Coverage	⚠️ Warning	Pull request introduces significant functionality changes to textarea components and ResizeObserver logic without corresponding test coverage for modified files.	Create comprehensive test files for text-area-wrapper.tsx, textarea.tsx, and flow-page-sliding-container.tsx verifying ResizeObserver functionality, styling changes, and padding modifications.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly addresses the main changes: adjusting textarea sizing/behavior and removing padding from playground layout components.
Test File Naming And Structure	✅ Passed	PR updates four frontend components with UI/layout improvements; no test files are present, so test file naming requirements are not applicable.
Excessive Mock Usage Warning	✅ Passed	PR modifies only UI/layout source files without introducing new tests or mock usage patterns.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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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 fix/prompt_playground_design

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[Cristhianzl]

lgtm

[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	18.39% (5918/32166)	12.03% (3016/25070)	12.36% (855/6917)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
2288	0 💤	0 ❌	0 🔥	32.221s ⏱️

[codecov]

Codecov Report

❌ Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.01%. Comparing base (22607cc) to head (a258015).

Files with missing lines	Patch %	Lines
...t-view/chat-input/components/text-area-wrapper.tsx	0.00%	15 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (40.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (41.84%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-v1.8.0   #11635      +/-   ##
==================================================
- Coverage           35.02%   35.01%   -0.01%     
==================================================
  Files                1515     1515              
  Lines               72567    72582      +15     
  Branches            10934    10936       +2     
==================================================
  Hits                25418    25418              
- Misses              45755    45770      +15     
  Partials             1394     1394              

Flag	Coverage Δ
frontend	16.65% <0.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
...onent/chat-view/chat-input/components/no-input.tsx	100.00% <ø> (ø)
...ntainer/components/flow-page-sliding-container.tsx	0.00% <ø> (ø)
src/frontend/src/components/ui/textarea.tsx	87.50% <ø> (ø)
...t-view/chat-input/components/text-area-wrapper.tsx	0.00% <0.00%> (ø)

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