chore: Block hardcoded Tailwind palette via Biome lint

[Cristhianzl]

OBJECTIVE: Enforce use of semantic color tokens from src/style/index.css over hardcoded Tailwind palette classes in frontend code.

CHANGES:

• Add Biome GritQL plugin flagging hardcoded Tailwind palettes (e.g. bg-zinc-900, text-slate-500) in JS/TS/TSX
• Refactor 8 files (knowledge ingestion UI, assistant panel, NodeStatus, etc.) to use semantic tokens (bg-accent-emerald, text-destructive, bg-error-red, …)
• Suppress plugin per-line in styleUtils.ts for the intentional decorative gradient palette
• Wire lint-js.yml into ci.yml as a required job gated on frontend path-filter
• Add fetch-depth: 0 to checkout so biome check --changed can diff against main

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[codecov]

Codecov Report

❌ Patch coverage is 67.08861% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.83%. Comparing base (bbe2ccd) to head (8aceec6).
⚠️ Report is 10 commits behind head on release-1.10.0.

Files with missing lines	Patch %	Lines
.../knowledgePage/components/IngestionRunsSection.tsx	8.33%	11 Missing ⚠️
...owledgePage/components/IngestionRunDetailModal.tsx	0.00%	9 Missing ⚠️
...antPanel/components/assistant-component-result.tsx	71.42%	2 Missing ⚠️
...seUploadModal/components/IngestionHistoryPanel.tsx	83.33%	2 Missing ⚠️
...chat-view/chat-messages/components/bot-message.tsx	0.00%	1 Missing ⚠️
...nd/src/components/core/sanitizedMarkdown/index.tsx	50.00%	1 Missing ⚠️

❌ Your project check has failed because the head coverage (49.30%) 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-1.10.0   #13125      +/-   ##
==================================================
+ Coverage           54.56%   54.83%   +0.27%     
==================================================
  Files                2140     2145       +5     
  Lines              199445   200237     +792     
  Branches            30124    30202      +78     
==================================================
+ Hits               108825   109802     +977     
+ Misses              89439    89252     -187     
- Partials             1181     1183       +2     

Flag	Coverage Δ
backend	59.90% <ø> (+0.18%)	⬆️
frontend	54.91% <67.08%> (+0.33%)	⬆️
lfx	49.30% <ø> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...mNodes/GenericNode/components/NodeStatus/index.tsx	34.51% <100.00%> (+0.18%)	⬆️
...ts/core/canvasControlsComponent/CanvasControls.tsx	89.88% <100.00%> (ø)
src/frontend/src/utils/styleUtils.ts	95.43% <100.00%> (+0.19%)	⬆️
...chat-view/chat-messages/components/bot-message.tsx	73.35% <0.00%> (ø)
...nd/src/components/core/sanitizedMarkdown/index.tsx	75.54% <50.00%> (+0.13%)	⬆️
...antPanel/components/assistant-component-result.tsx	37.66% <71.42%> (-0.27%)	⬇️
...seUploadModal/components/IngestionHistoryPanel.tsx	88.23% <83.33%> (+0.11%)	⬆️
...owledgePage/components/IngestionRunDetailModal.tsx	10.55% <0.00%> (ø)
.../knowledgePage/components/IngestionRunsSection.tsx	10.14% <8.33%> (-0.10%)	⬇️

... and 89 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	38.41% (47907/124697)	67.9% (6542/9634)	38.28% (1100/2873)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
4302	0 💤	0 ❌	0 🔥	9m 13s ⏱️