fix: Fix image preview for Windows paths in playground

[Cristhianzl]

OBJECTIVE: Fix image files sent from Windows not displaying in the playground chat by normalizing backslash paths to forward slashes across all file utility functions.

CHANGES:

• Normalize Windows backslash paths (\) to forward slashes (/) in isImageFile, getFileDisplayName, getFilePreviewUrl, and
  extractFileInfo
• Simplify FilePreviewDisplay by removing manual blob fetch logic and using direct image URLs with crossOrigin="use-credentials"
• Add crossOrigin="use-credentials" to FileCard image element for consistent auth handling
• Add comprehensive unit tests for all file utility functions covering Windows paths, Unix paths, and cross-platform scenarios

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[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.22%. Comparing base (699e356) to head (e883a78).
⚠️ Report is 3 commits behind head on release-1.8.1.

Files with missing lines	Patch %	Lines
...Component/chat-view/utils/file-preview-display.tsx	0.00%	7 Missing and 4 partials ⚠️
.../playgroundComponent/chat-view/utils/file-utils.ts	76.92%	0 Missing and 3 partials ⚠️

❌ Your project status has failed because the head coverage (41.47%) 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-1.8.1   #12136      +/-   ##
=================================================
+ Coverage          37.18%   37.22%   +0.03%     
=================================================
  Files               1592     1592              
  Lines              78216    78196      -20     
  Branches           11865    11858       -7     
=================================================
+ Hits               29087    29107      +20     
+ Misses             47461    47429      -32     
+ Partials            1668     1660       -8     

Flag	Coverage Δ
backend	57.29% <ø> (-0.06%)	⬇️
frontend	21.01% <41.66%> (+0.10%)	⬆️
lfx	41.47% <ø> (ø)

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

Files with missing lines	Coverage Δ
...ts/chatView/fileComponent/components/file-card.tsx	0.00% <ø> (ø)
.../playgroundComponent/chat-view/utils/file-utils.ts	85.71% <76.92%> (+65.71%)	⬆️
...Component/chat-view/utils/file-preview-display.tsx	42.50% <0.00%> (-2.12%)	⬇️

... and 9 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	23.45% (8229/35085)	16.17% (4452/27531)	16.23% (1197/7375)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
2720	0 💤	0 ❌	0 🔥	45.295s ⏱️

[Cristhianzl]

These changes were already tested and verified: #12083