feat(media-library): add preview.da.live authentication support for p…

[kmurugulla]

…rotected sites

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before:
  https://da.live/apps/media-library#/adobecom/da-bacom-blog
  https://da.live/apps/media-library#/aemsites/vitamix
• After:
  https://da.live/apps/media-library?nx=imgpreview#/adobecom/da-bacom-blog
  https://da.live/apps/media-library?nx=imgpreview#/aemsites/vitamix

Changes

• Auto-detects auth requirements via HEAD request to index.md
• Sets partitioned cookie on preview.da.live for authenticated access
• Displays images using preview.da.live URLs & while fetching metadata through CORS proxy with site tokens
• Maintains auth context during modal navigation
• Improves error messages (removes HTTP status codes)

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Commits

• 27d8c5b ✅ (latest)
• b94dd6a ✅

[amol-anand]

Code review — 5 issues flagged (2 high priority, 3 medium priority). See inline comments.