feat(ui): F8-12 — owner feedback round 2 (#55)

* Bug fix: theme flip no longer leaves planets oversized. The
  camera-preserving remount now calls a new
  `RendererHandle.refreshCameraDerivedDraws` explicitly after the
  manual moveCenter/setZoom pair so the post-mount geometry tracks
  `viewport.scaled` even if pixi-viewport's `'zoomed'` listener
  races the next Ticker tick.
* Doc #3: clicks on a planet label route through the same hit-test
  path as a click on the disc. The label `Container` now has a
  pointer hit area sized to the text + frame padding; pointertap
  simulates a click at the planet centre, so selection and
  pick-mode resolution behave identically.
* Doc #4: battle X-crosses + cargo arrowhead wings grow
  sub-linearly with zoom (PLANET_SIZE_ZOOM_ALPHA). New
  `Style.softLengthAnchor` ('center' / 'start') makes the renderer
  treat the recorded endpoints as the geometry "at the reference
  scale" and rescale around the midpoint (X-cross) or the start
  endpoint (arrow wings). Arrowhead base length is halved from 6
  to 3 world units to match the owner's "in half" request.
* Doc #5: picker overlay loses the anchor ring at the source, the
  cursor line drops to a cargo-route-thin 0.6 px stroke, and the
  hover ring around the destination is replaced by a planet-style
  outline (visible disc + 1 px padding) in the `pickHighlight`
  accent — so candidate destinations read like selection in warm
  yellow.
* Doc #6: regression test pins the in-disc hit zone.
* Perf #1: camera-driven redraws are throttled onto the next
  Ticker tick. A rapid wheel / pinch burst now coalesces into at
  most one `clear() + redraw` pass per painted frame, which keeps
  the 500-planet map responsive on zoom and toggle flips.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/frontend/src/map/pick-mode.ts

@@ -83,10 +83,17 @@ export interface PickOverlaySpec {
 	readonly dimmedIds: ReadonlySet<PrimitiveID>;
 }
 
-/** Anchor / hover outline padding in world units (the rings sit
- * outside the visible disc so the planet stays clearly visible). */
+/** Anchor / hover outline padding. F8-12 / #5 retired the anchor
+ * ring from the picker overlay, so `ANCHOR_PADDING_WORLD` is now
+ * dead — kept exported for legacy test coverage that asserts the
+ * spec stays shaped the same way. `HOVER_PADDING_PX` is the
+ * screen-pixel gap the picker hover-ring leaves between the
+ * destination disc edge and the stroke; it matches the regular
+ * planet outline (`OUTLINE_RADIUS_PADDING_PX` in `render.ts`) so
+ * "selection" and "pick hover" outlines feel identical at every
+ * zoom. */
 export const ANCHOR_PADDING_WORLD = 6;
-export const HOVER_PADDING_WORLD = 4;
+export const HOVER_PADDING_PX = 1;
 
 /**
  * computePickOverlay produces a `PickOverlaySpec` for the current
@@ -173,10 +180,11 @@ export function computePickOverlay(
 				cameraScale,
 				scaleRef,
 			);
+			const paddingWorld = cameraScale > 0 ? HOVER_PADDING_PX / cameraScale : 0;
 			hoverOutline = {
 				x: target.x,
 				y: target.y,
-				radius: targetRadius + HOVER_PADDING_WORLD,
+				radius: targetRadius + paddingWorld,
 			};
 		}
 	}
@@ -208,8 +216,13 @@ export function computePickOverlay(
  * as obviously inert against the map background.
  */
 export const PICK_OVERLAY_STYLE = {
-	anchor: { alpha: 0.9, width: 2 },
-	line: { alpha: 0.5, width: 1 },
-	hover: { alpha: 1, width: 2 },
+	anchor: { alpha: 0.9, widthPx: 2 },
+	// F8-12 / #5: cursor line uses the same screen-pixel thickness as
+	// a regular cargo-route shaft (0.6 px), and the hover ring around
+	// the destination matches the planet-outline stroke (1.5 px). The
+	// renderer divides by `cameraScale` before drawing so the values
+	// stay constant on screen at any zoom.
+	line: { alpha: 0.95, widthPx: 0.6 },
+	hover: { alpha: 0.95, widthPx: 1.5 },
 	dimAlpha: 0.35,
 } as const;