tools: web viewer shows the owner's world; collapsible phone menu (W2)

export_world.py exports the owner four-strate world (LOD0-2 around each arrival + one FI
passage view) through the headless mesh exporter and converts to GLB (16-45 MB, 0.6-1.7M
triangles each); GLBs are git-ignored and regenerated by the script. Menu collapses to a
button (collapsed by default on phones), smaller phone controls, loading progress and errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Tools/webviewer/W2-REPORT.md

@@ -0,0 +1,23 @@
+# W2 web viewer report
+
+Exported the owner's `Standalone/data/owner_world.json` with the existing L101 headless mesh exporter, `--clip-radius=3`, and LOD0–2. The five GLBs are in `meshes/`; sizes are decimal MB.
+
+| View | GLB size | Triangles |
+|---|---:|---:|
+| `sw-arrival.glb` | 15.89 MB | 605,310 |
+| `fi-arrival.glb` | 31.29 MB | 1,214,996 |
+| `tn-arrival.glb` | 30.71 MB | 1,199,460 |
+| `vs-arrival.glb` | 27.72 MB | 1,096,822 |
+| `fi-passage.glb` | 45.09 MB | 1,743,474 |
+
+The web menu now collapses to a button and starts collapsed at phone widths. Phone text and controls are smaller. Mesh-list and GLB loading show progress, and failures display an error. The viewer selects `sw-arrival.glb` by default when it is present.
+
+Refresh all five views from the repository root with:
+
+```sh
+python3 Standalone/Tools/webviewer/export_world.py
+```
+
+The script applies the requested affinity and 6 GiB address-space limit, converts through the W1 `convert.py`, and writes run logs plus `export-summary.json` to `Saved/Linux/w2/`. No position or normal quantization was needed; the largest file is 45.09 MB.
+
+Not verified: loading and visually inspecting these new GLBs in the owner's phone browser, or measuring phone transfer time and memory use. The headless exports and conversions completed successfully.