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/src/lib/sidebar/inspector-tab.svelte

@@ -108,6 +108,12 @@ from the Phase 10 stub.
 	const localFleets = $derived(renderedReport?.report?.localFleets ?? []);
 	const otherRaces = $derived(renderedReport?.report?.otherRaces ?? []);
 	const localRace = $derived(renderedReport?.report?.race ?? "");
+	const bombings = $derived(renderedReport?.report?.bombings ?? []);
+	const selectedPlanetBombing = $derived(
+		selectedPlanet === null
+			? null
+			: (bombings.find((b) => b.planetNumber === selectedPlanet.number) ?? null),
+	);
 </script>
 
 <section class="tool" data-testid="sidebar-tool-inspector">
@@ -124,6 +130,7 @@ from the Phase 10 stub.
 			{localShipGroups}
 			{otherShipGroups}
 			{localRace}
+			bombing={selectedPlanetBombing}
 		/>
 	{:else if selectedShipGroup !== null}
 		<ShipGroup