Scene view symbols as SVG files: icons paragraph in Scene editing, symbolIcons in Architecture, check sum 1093 (#175)

Architecture.md

@@ -92,6 +92,7 @@ src/runtime/physics/   engine (loads Rapier once, reports its state, converts be
                        what the physics nodes reach through `NodeContext.physics`)
 src/ui/                widget toolkit (generic, knows nothing about assets)
 src/viewport/          view (transforms), items (what to draw), symbols (how to draw it),
+                       symbolIcons (the SVG files in icons/, parsed once, in the theme's colours, #175),
                        FileLibrary (load once, never retry a failure, tell the listeners) ← TextureLibrary, FontLibrary;
                        SoundLibrary, ShaderLibrary, ParticleLibrary,
                        particles (one ParticleContainer per source), tilemap (one container per layer),

Development.md

@@ -12,7 +12,7 @@ npm run check        # typecheck + lint + format:check + tests, the gate CI runs
                      #   code is lost (tail's is reported), so a red run reads as green
 npm run build        # writes dist/ and regenerates index.html
 ./build.sh           # the same under `set -o pipefail`, for callers that pipe the output
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1092 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1093 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result

Scene-editing.md

@@ -16,6 +16,17 @@ constant size on screen however far you zoom, and both kinds of them — the obj
 Scene tab and the frame names of the Texture tab — read that size from one token
 (`Theme.viewportLabelSize`); the two `viewportLabel` styles differ in colour only.
 
+**The symbol icons are SVG files** (#175): behavior, container, rigidbody, camera and particle
+source each have one in `src/viewport/icons/`, bundled with the editor and parsed once. A file
+draws in the symbol's own units with the origin at its centre (the `viewBox` is centred on it, so
+the file looks the same in any SVG viewer), and `currentColor` stands for the colour the theme
+gives that symbol. To change an icon, edit its file and build. Pixi's SVG parser is not a browser,
+so the files keep to what both draw alike, and `tests/viewport/symbol-icons.test.ts` holds them to
+it: only `path`, `circle`, `rect`, `ellipse` and `line` (Pixi reads `polygon` points as whole
+numbers), no `transform` (ignored), every shape states its `fill` (a browser fills a shape without
+one black, Pixi does not), colours as `#rrggbb`, `none` or `currentColor`. What stays code is what
+depends on the object: the camera's frame and a collider's outline.
+
 **Z-order is part of the position.** `position.z` is the draw order of a scene object: higher
 `z` is drawn on top; objects with equal `z` keep their hierarchy (tree) order. It is edited in the
 inspector next to X/Y, undoable like any move, and applies in edit and play mode alike. The layers