Trim needless comments and fix the picker width

Remove comments that only restate the code, keeping the section banners
and the notes that carry a reason, a measured fact or an external
contract.

ButtonOptions.width claimed to be a fixed width but only set minWidth,
so the Graph and Texture pickers grew with the name they showed. It is
now what it promises, with a separate minWidth for the buttons that have
two forms. Narrow buttons shrink their padding, otherwise a 24px icon
button had 8px left for its glyph and truncate dropped it entirely.

__gm.labelsDropped() guards that class: the overflow guard only saw text
that was too wide, never a label truncated to nothing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/core/graph/nodes/data/Compare.ts

@@ -28,8 +28,8 @@ export const Compare: NodeDef = {
     },
   ],
   run: (_ctx, inputs, params) => {
-    // The fallback matches the param's declared default, so a node whose setting is missing
-    // (an old document, a hand-written graph) behaves like a freshly created one.
+    // The fallback matches the param's declared default, so a node with no setting behaves
+    // like a freshly created one.
     const compare = OPERATORS[String(params.op)] ?? OPERATORS['<']!;
     return { outputs: { result: compare(asNumber(inputs.a), asNumber(inputs.b)) } };
   },