feat(ui): F8-12 — map polish (zoom invariance, labels, selection, soft radius) (#55)

* Honest pixel-space sizing for `pointRadiusPx` / `strokeWidthPx`: the
  renderer divides by the current camera scale on every
  `viewport.zoomed` so thin lines / small markers stay the same on-screen
  size at any zoom.
* Known-size planets switch to `pointRadiusWorld`, softened against the
  reference scale by `PLANET_SIZE_ZOOM_ALPHA = 0.33`; unidentified
  planets pin to a 3-px disc.
* New planet label layer renders a two-line `name / #N` legend under
  each planet (`#N` only for unidentified or when the new `planetNames`
  toggle is off). Selection now paints an inverse-fill frame around the
  selected planet's label plus an outline on the disc; the old
  selection-ring primitive is retired.
* Bombing markers swap the separate CirclePrim for a planet-outline
  overlay (damaged / wiped colour); the report deep-link moves to a
  "view bombing report" link in the planet inspector.
* Docs + tests follow: `renderer.md` reflects the new sizing contract +
  label / outline layers, vitest covers the sizing math, label
  formatting, and the new toggle, and the map-toggles e2e adds a
  persistence case for `planetNames`.

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

ui/frontend/tests/map-toggles-component.test.ts

@@ -59,6 +59,7 @@ describe("MapTogglesControl", () => {
 		expect(ui.getByTestId("map-toggles-uninhabited-planets")).toBeChecked();
 		expect(ui.getByTestId("map-toggles-unidentified-planets")).toBeChecked();
 		expect(ui.getByTestId("map-toggles-unreachable-planets")).toBeChecked();
+		expect(ui.getByTestId("map-toggles-planet-names")).toBeChecked();
 		expect(ui.getByTestId("map-toggles-visible-hyperspace")).toBeChecked();
 		expect(ui.queryByTestId("map-toggles-wrap-torus")).toBeNull();
 		expect(ui.queryByTestId("map-toggles-wrap-no-wrap")).toBeNull();
@@ -91,6 +92,17 @@ describe("MapTogglesControl", () => {
 		expect(setMapToggle).not.toHaveBeenCalledWith("bombingMarkers", false);
 	});
 
+	test("planet-names checkbox flips the planetNames toggle (F8-12 / #29)", async () => {
+		const store = buildStore();
+		const setMapToggle = vi
+			.spyOn(store, "setMapToggle")
+			.mockResolvedValue(undefined);
+		const ui = render(MapTogglesControl, { props: { store } });
+		await fireEvent.click(ui.getByTestId("map-toggles-trigger"));
+		await fireEvent.click(ui.getByTestId("map-toggles-planet-names"));
+		expect(setMapToggle).toHaveBeenCalledWith("planetNames", false);
+	});
+
 	test("Escape closes the popover", async () => {
 		const store = buildStore();
 		const ui = render(MapTogglesControl, { props: { store } });