Luix v1.4.2 - Thumbnail/Gutter Hotfix

Asset thumbnail hover / gutter — false "moderated" after edits

Changing an rbxassetid://… value (or hovering one Roblox has just
started thumbnailing) often showed "Thumbnail unavailable (asset may
be moderated, deleted, or the API is unreachable)" for a full minute,
even when the asset was fine — only a window reload would clear it.

• Stop caching transient API states. Roblox's thumbnails API
  returns Pending / InReview while it's still generating the
  image (typical for freshly-referenced assets), and
  Error / TemporarilyUnavailable during backend hiccups. The
  previous implementation only treated Completed as success and
  cached every other state — transient or not — as a failure for
  60 seconds. Now transient states bypass the cache entirely so the
  next hover or gutter refresh retries against the (usually
  now-Completed) response.
• 10 s settled-failure TTL (was 60 s). Even when a fetch
  genuinely fails — typo'd ID, network blip — fixing it gets a fresh
  fetch on the next interaction instead of stranding the user behind
  a minute-long cache.
• State-aware hover message. Instead of always saying "asset
  may be moderated, deleted, or the API is unreachable", the hover
  now reflects the actual API state: "Roblox is still generating
  the thumbnail — hover again in a few seconds" for Pending /
  InReview, "temporarily unavailable" for Error /
  TemporarilyUnavailable, "asset has been moderated or removed"
  for Blocked / Moderated.