refactor: remove redundant fields from media library index to reduce size

[kmurugulla]

Summary

Reduces media library index size by ~40% by removing redundant fields (name, status, nameSource,
timestampSource, latestUsageTimestamp) and deriving them at runtime instead.

Index entries now contain only 10 essential fields: hash, url, originalPath, timestamp, user,
operation, type, doc, displayName, and modifiedTimestamp. The status field is derived from
doc via getItemStatus() (empty = unused, non-empty = referenced), and displayName replaces the legacy
name field.

Factory functions (createMedialogEntry, toExternalMediaEntry, toLinkedContentEntry) centralize entry
creation to ensure consistency. All UI features and filters continue to work identically with backward
compatibility for old indexes, but we can silently replace index with ?full=true.

Test URLs:

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

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Commits

• 2b65e90 ✅ (latest)
• 97303e3 ✅