Four small UX fixes to the asset explorer:
1. Remove the no-op "View" menu (Textures/Meshes/Audio toggles + Wireframe
checkbox) — none were wired to anything. Dropped ViewMode + the current_mode/
wireframe fields from ViewerState (nothing read them); the central panel
already dispatches on which preview resource is populated.
2. Loading indicator — clicking a drawer item now flips FileBrowserState.loading
and the central panel shows a centered spinner + "Loading <name>…" until the
background read/decode applies, instead of leaving the previous item on screen
with no feedback. Cleared in poll_loader_channel on FileLoaded/PakLoaded/
Error/Cancelled.
3. Drawer shows only the .pak index, not its .pNN data segments — the segments
are the pack's body (loaded when the .pak is opened), so listing them (with no
preview) was noise. Dropped the virtual "<stem>.pak" folder too; the .pak now
sits as a normal leaf in its real directory.
4. Bottom status bar no longer overflows — horizontal_wrapped, only the source's
final path component (full path on hover), file count, and a right-aligned,
shortened controls hint. Removed the mode label.
Viewer + formats build; all tests pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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