Wire up file open for the web build:
- `io::pick_and_load_web`: browser file picker → read bytes → parse via
`load_bytes` → build caches, returning the same payload as the native
loader so it feeds the shared `Message::FileOpened` handler.
- `Message::OpenFile` cfg-dispatches: native picks a path then loads on a
worker thread; web picks + parses in one async step. The web branch also
sets `opening` (the handler drops results when no open is in progress).
- Disable the cosmic-text shaping / fallback paths on wasm: the web has no
system fonts, so cosmic-text panics with "no default font found". LFF
stroke fonts (embedded) still render; LFF-missing glyphs are skipped.
Native build + 75 tests unchanged. Hatches still don't draw on the web.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Move the 30 flat modules under src/scene/ into six folders by role:
convert (entity→geometry), text (fonts/shaping), model (render models),
pick (hit-test/selection/grips/xclip), view (camera/transform/render),
cache (block + property caches). pipeline/ is unchanged.
Full path migration — all `scene::X` references become
`scene::<group>::X`, no compatibility re-exports. render.rs items that
were `pub(super)` (parent was scene) become `pub(in crate::scene)` to
keep their original scene-wide visibility.
No behavior change; build and tests are green.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
