Re-tune render sizes for the world-space model: smaller defaults, wide low ends

The defaults were calibrated in the screen-fixed era; world-scaling renders
sizes at setting x k/kFit, so at the default label gate (2x fit) everything
read ~2x too big ("labels way too large even at the minimum"). Fit-zoom
normalizes layout scale away, so the fix belongs in sizes, not layout:
spreading nodes further apart in world units changes nothing at fit.

- Defaults: nodeSize 6 -> 4, arrowLength 5 -> 4, labelSize 12 -> 7.
- Clamps/slider ranges widened at the low end: nodeSize 1-14 (step 0.5),
  edgeWidth 0.25-4 (step 0.25), arrowLength 1-15 (step 0.5),
  labelSize 3-24 (step 0.5).
- GLOW_PAD 9 -> 6 (halo dominated small discs), REGION_LABEL_SIZE 18 -> 14.
- Tests updated for the new clamp bounds plus a low-end pass-through case
  (403/403). The saved render-settings.json still shadows defaults by
  design; the local copy was reset so the new defaults showed immediately.

components/graph-canvas.ts

@@ -117,7 +117,7 @@ const LABEL_LINE_HEIGHT = 1.3;
 /** Zoom span (camera-ratio units) over which labels fade together. */
 export const LABELS_FADE_SPAN = 0.5;
 
-const GLOW_PAD = 9; // px the halo extends beyond the node disc (constant)
+const GLOW_PAD = 6; // px the halo extends beyond the node disc (constant)
 const GLOW_ALPHA = 0.45; // halo opacity at the disc edge, fading outward
 const HOVER_FADE_MS = 180; // hover halo opacity fade length
 const ZOOM_EASE_MS = 45; // wheel-zoom glide: exponential-ease time constant (~250ms per notch)
@@ -139,7 +139,7 @@ const HULL_FILL_LAYERS = [
 ] as const;
 const HULL_STROKE_PAD = 14;
 const HULL_CORNER_RADIUS = 9;
-const REGION_LABEL_SIZE = 18;
+const REGION_LABEL_SIZE = 14;
 
 /** All "px" constants above are screen px AT FIT ZOOM. The renderer scales
  *  them into world units (÷ kFit) once per geometry build; camera zoom then

components/graph-view.tsx

@@ -500,33 +500,33 @@ export function GraphView() {
 						<div className="mt-1.5 flex flex-col gap-2 border-t pt-1.5">
 							<SettingSlider
 								label="Node size"
-								min={2}
+								min={1}
 								max={14}
-								step={1}
+								step={0.5}
 								value={settings.nodeSize}
 								onChange={(v) => changeSettings((cur) => ({ ...cur, nodeSize: v }))}
 							/>
 							<SettingSlider
 								label="Edge width"
-								min={0.5}
+								min={0.25}
 								max={4}
-								step={0.5}
+								step={0.25}
 								value={settings.edgeWidth}
 								onChange={(v) => changeSettings((cur) => ({ ...cur, edgeWidth: v }))}
 							/>
 							<SettingSlider
 								label="Arrowhead size"
-								min={2}
+								min={1}
 								max={15}
-								step={1}
+								step={0.5}
 								value={settings.arrowLength}
 								onChange={(v) => changeSettings((cur) => ({ ...cur, arrowLength: v }))}
 							/>
 							<SettingSlider
 								label="Label size"
-								min={6}
+								min={3}
 								max={24}
-								step={1}
+								step={0.5}
 								value={settings.labelSize}
 								onChange={(v) => changeSettings((cur) => ({ ...cur, labelSize: v }))}
 							/>

src/core/render-settings.ts

@@ -22,18 +22,23 @@ export interface GraphRenderSettings {
 	arrowLength: number;
 	/** Camera-ratio threshold for node labels (see module doc). */
 	labelZoom: number;
-	/** Node + hover label font size, px. */
+	/** Node + hover label font size, px at fit zoom (scales with camera). */
 	labelSize: number;
 	/** Toggle for the cluster region labels (hulls always draw). */
 	clusterLabels: boolean;
 }
 
+// Sizes are screen px AT FIT ZOOM (the world-space renderer scales them
+// with the camera, so a label reads at labelSize x k/kFit on screen).
+// Defaults were re-tuned for world-scaling on 2026-09-13: the old values
+// were calibrated in the screen-fixed era, so everything rendered ~2x
+// too big once sizes started scaling with the graph.
 export const DEFAULT_RENDER_SETTINGS: GraphRenderSettings = {
-	nodeSize: 6,
+	nodeSize: 4,
 	edgeWidth: 1,
-	arrowLength: 5,
+	arrowLength: 4,
 	labelZoom: 0.5,
-	labelSize: 12,
+	labelSize: 7,
 	clusterLabels: true,
 };
 
@@ -51,12 +56,12 @@ export function sanitizeRenderSettings(raw: unknown): GraphRenderSettings {
 		return clamp(n, min, max);
 	};
 	return {
-		nodeSize: num(r.nodeSize, DEFAULT_RENDER_SETTINGS.nodeSize, 2, 14),
-		edgeWidth: num(r.edgeWidth, DEFAULT_RENDER_SETTINGS.edgeWidth, 0.5, 4),
-		arrowLength: num(r.arrowLength, DEFAULT_RENDER_SETTINGS.arrowLength, 2, 15),
+		nodeSize: num(r.nodeSize, DEFAULT_RENDER_SETTINGS.nodeSize, 1, 14),
+		edgeWidth: num(r.edgeWidth, DEFAULT_RENDER_SETTINGS.edgeWidth, 0.25, 4),
+		arrowLength: num(r.arrowLength, DEFAULT_RENDER_SETTINGS.arrowLength, 1, 15),
 		// Range matches the log slider's span [LABEL_ZOOM_MIN, LABEL_ZOOM_MAX].
 		labelZoom: num(r.labelZoom, DEFAULT_RENDER_SETTINGS.labelZoom, 0.0625, 4),
-		labelSize: num(r.labelSize, DEFAULT_RENDER_SETTINGS.labelSize, 6, 24),
+		labelSize: num(r.labelSize, DEFAULT_RENDER_SETTINGS.labelSize, 3, 24),
 		clusterLabels:
 			typeof r.clusterLabels === "boolean" ? r.clusterLabels : DEFAULT_RENDER_SETTINGS.clusterLabels,
 	};

tests/render-settings.test.ts

@@ -44,13 +44,21 @@ describe("sanitizeRenderSettings", () => {
 			clusterLabels: "yes" as unknown as boolean,
 		});
 		assert.equal(s.nodeSize, 14); // clamped to max
-		assert.equal(s.edgeWidth, 0.5); // clamped to min
-		assert.equal(s.arrowLength, 2);
+		assert.equal(s.edgeWidth, 0.25); // clamped to min
+		assert.equal(s.arrowLength, 1);
 		assert.equal(s.labelZoom, LABEL_ZOOM_MAX);
 		assert.equal(s.labelSize, DEFAULT_RENDER_SETTINGS.labelSize); // NaN-safe reset
 		assert.equal(s.clusterLabels, DEFAULT_RENDER_SETTINGS.clusterLabels);
 	});
 
+	test("the widened low ends accept small sizes", () => {
+		const s = sanitizeRenderSettings({ nodeSize: 1, edgeWidth: 0.25, arrowLength: 1, labelSize: 3 });
+		assert.deepEqual(
+			{ nodeSize: s.nodeSize, edgeWidth: s.edgeWidth, arrowLength: s.arrowLength, labelSize: s.labelSize },
+			{ nodeSize: 1, edgeWidth: 0.25, arrowLength: 1, labelSize: 3 },
+		);
+	});
+
 	test("a fully valid object passes through unchanged", () => {
 		const valid = { nodeSize: 8, edgeWidth: 2, arrowLength: 7, labelZoom: 0.25, labelSize: 16, clusterLabels: false };
 		assert.deepEqual(sanitizeRenderSettings(valid), valid);