feat: Add legacy shaders, model I/O, and project panel functionality

- Introduced `legacy-shaders.js` containing vertex and fragment shaders for rendering.
- Implemented `model-io.js` for parsing and encoding GLB files, ensuring compatibility with glTF 2.0.
- Created `project-panel.js` to manage project resources and survey overlays, enhancing user interaction.
- Added `solar.js` for calculating solar positions based on UTC time, latitude, and longitude.
- Developed `three-renderer.js` as a standard backend for Three.js, managing scene rendering and material synchronization.
- Included a new GLB model `dum.glb` for testing and demonstration purposes.
- Established `data_checks.mjs` for validating model data and ensuring integrity of assets.
- Created `prepare_export.py` to facilitate Blender GLB exports, maintaining material and node references.
- Added `vendor_three.py` to download and configure a local version of Three.js for the project.

locenice2/TEST_REPORT.json

@@ -0,0 +1,93 @@
+{
+  "data_checks_passed": 96,
+  "ui_checks_passed": 14,
+  "ui_page_errors": [],
+  "ui_graphics": "Mock WebGL API for controller/layout tests. No real 3D rendering.",
+  "syntax_checks": [
+    "PHP index.php lint",
+    "JavaScript modules node --check",
+    "Python helpers compilation"
+  ],
+  "http_checks": "Local PHP server returned HTTP 200 for page, scripts, JSON, CSS and model.",
+  "export_mapping_test": "Synthetic reversed node/material order: passed. Not tested with a real Blender export.",
+  "not_verified": [
+    "Live WebGL 2 rendering",
+    "Three.js CDN imports in an unrestricted browser",
+    "Blender helper execution",
+    "Network part of the optional vendoring helper",
+    "User hosting deployment"
+  ],
+  "environment_limitation": "Browser policy blocks WebGL and navigations; outbound container network blocked.",
+  "ui_checks": [
+    {
+      "name": "Defaults",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Blinds all nine rectangular openings",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Blinds off",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Nine floor rooms",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Kitchen independent colours",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Invalid colour rejected",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Walkin alternative",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Source binary roundtrip",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Summary export schema",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Pure astronomical function",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Reference photos loaded",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Survey overlay 27 points maximum",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "No horizontal page overflow on mobile",
+      "ok": true,
+      "value": true
+    },
+    {
+      "name": "Mobile interior panel visible",
+      "ok": true,
+      "value": true
+    }
+  ]
+}