ui/phase-13: planet inspector — read-only

Plumbs the map → inspector pathway: a click on a planet selects it
through the new SelectionStore, the sidebar Inspector tab swaps
its empty-state copy for a per-kind read-only field set, and a
mobile-only bottom-sheet mirrors the same content over the map.
Field projection in api/game-state.ts now surfaces every documented
planet field.

ui/PLAN.md

@@ -1453,36 +1453,74 @@ on the map; read-only, no actions yet.
 Artifacts:
 
 - `ui/frontend/src/lib/sidebar/inspector-tab.svelte` empty state
-  (`select an object on the map`) and routing per selected-object kind
+  (`select an object on the map`) and routing per selected-object
+  kind. The tab reads the selection and game-state stores from
+  context and hands a resolved `ReportPlanet` to the planet inspector
+  component.
 - `ui/frontend/src/lib/inspectors/planet.svelte` read-only display of
-  every planet field documented in `docs/FUNCTIONAL.md` §6 and the
-  [`rules.txt`](../game/rules.txt) planet section: name, coordinates, size, population,
-  industry, materials stockpile, industry stockpile, colonists,
-  natural resources, current production type, free production
-  potential
-- map click handler that selects the planet and switches sidebar to
-  Inspector (or raises bottom-sheet on mobile)
-- selection store `ui/frontend/src/lib/selection.ts` holding the
-  currently selected map object id
+  every planet field carried by the FBS report and documented in
+  the `rules.txt` planet section: name, coordinates, size, population,
+  colonists, industry, industry stockpile (`capital`, `$`), materials
+  stockpile (`material`, `M`), natural resources, current production
+  type, free production potential. Per-kind nullable fields collapse
+  silently — uninhabited and unidentified planets render the smaller
+  field set the engine carries for them.
+- `ui/frontend/src/lib/inspectors/planet-sheet.svelte` mobile-only
+  bottom-sheet that wraps the same planet component for the < 768 px
+  breakpoint. Visibility is gated on `effectiveTool === "map"` so the
+  sheet does not stack with the calc / order overlays.
+- `ui/frontend/src/lib/active-view/map.svelte` registers a click
+  handler against the new `RendererHandle.onClick` (built on
+  `pixi-viewport`'s `clicked` event), translates the hit into a
+  planet, and calls `SelectionStore.selectPlanet(number)`.
+- `ui/frontend/src/lib/selection.svelte.ts` runes store with the
+  selected-object union (`{ kind: "planet"; id: number } | null`),
+  exposed via `setContext` from the in-game shell layout. Lifetime
+  matches the layout instance — selection survives every active-view
+  switch but does not persist across reloads.
+- `ui/frontend/src/api/game-state.ts` projection extended to surface
+  every planet field needed by the inspector (`industryStockpile`,
+  `materialsStockpile`, `industry`, `population`, `colonists`,
+  `production`, `freeIndustry`, plus the existing `owner`).
+- `ui/frontend/src/routes/games/[id]/+layout.svelte` lifts
+  `activeTab` into a layout-level rune bound into the sidebar, owns
+  the `SelectionStore`, mounts the bottom-sheet, and runs the
+  reveal `$effect` that flips the sidebar to the inspector tab and
+  opens the tablet drawer when a new selection lands.
 
 Dependencies: Phase 11.
 
 Acceptance criteria:
 
 - clicking any visible planet on the map shows its details in the
-  inspector tab on desktop and bottom-sheet on mobile;
-- selection state persists across view switches (per global state-
-  preservation rule);
+  inspector tab on desktop and tablet (drawer auto-opens), and in a
+  bottom-sheet on mobile;
+- selection state persists across view switches inside `/games/:id/*`
+  (per global state-preservation rule); reload starts fresh;
+- a click on empty map area is a no-op — selection is cleared only
+  by the explicit close button (`✕`) on the mobile sheet;
 - empty inspector renders the empty-state message when no planet is
-  selected.
+  selected;
+- mobile dismissal is the close button only; swipe-to-dismiss and
+  tap-outside-to-dismiss are deferred to Phase 35;
+- a selection that no longer matches a visible planet (visibility
+  lost between turns) collapses to the empty state instead of
+  showing stale rows;
+- selected-planet visual feedback on the map (ring / halo) is
+  intentionally out of scope and rolls into Phase 35.
 
 Targeted tests:
 
-- Vitest component tests for the planet inspector with fixture data;
-- Playwright e2e: click a seeded planet, assert all expected fields are
-  rendered;
-- mobile-viewport Playwright run validating the bottom-sheet
-  presentation.
+- Vitest unit (`tests/selection-store.test.ts`) for the runes store;
+- Vitest component (`tests/inspector-planet.test.ts`) for per-kind
+  field rendering against synthetic `ReportPlanet` fixtures;
+- Vitest component (`tests/game-shell-sidebar.test.ts`) extended for
+  the selection-driven inspector content and the missing-planet
+  fallback;
+- Playwright e2e (`tests/e2e/game-shell-inspector.spec.ts`) clicks a
+  seeded planet on `chromium-desktop` and asserts the sidebar
+  inspector content, and on `chromium-mobile-iphone-13` asserts the
+  bottom-sheet appears and the close button clears it.
 
 ## Phase 14. First End-to-End Command — Rename Planet
 
@@ -2342,6 +2380,10 @@ Artifacts:
 - accessibility audit results recorded under `ui/docs/a11y.md`
 - keyboard-only navigation paths for lobby, game view, and login
 - focus rings, ARIA labels, screen-reader-only text where needed
+- mobile bottom-sheet swipe-down dismissal and tap-outside dismissal,
+  on top of the close button shipped in Phase 13
+- selected-planet visual on the map (ring or halo), wired off the
+  Phase 13 `SelectionStore`
 
 Dependencies: Phase 33.