map: click a region to switch the dossier to its owner; fix "no owner" (v0.7.0)

AGENTS.md

@@ -72,7 +72,7 @@ history/
     │   └── utils.ts        # cn()
     └── components/
         ├── PresetPicker.tsx / NationSelect.tsx   # home + nation pick screens
-        ├── WorldMap.tsx     # MapLibre basemap + choropleth + click popup + player highlight
+        ├── WorldMap.tsx     # MapLibre basemap + choropleth + click→dossier + hover tooltip + player highlight
         ├── NationPanel.tsx  # a nation's stats/territory/diplomacy dossier
         ├── ActionPanel.tsx  # tabs: Action / Diplomacy / Advisor + pending-queue list (per-item trash button + confirm dialog) + "Jump forward"
         ├── EventFeed.tsx    # scrolling event log (newest first)
@@ -140,6 +140,17 @@ history/
   (model down) surfaces as an HTTP 502 to the client (shown as a toast).
 - **Stable per-nation colors.** `shared.nationColor(id)` hashes a nation id → hue, shared by the
   server's `RegionMap` and any client coloring so the choropleth always agrees.
+- **Map click → dossier target (owner resolved from the RegionMap).** Clicking a map region does
+  NOT open a popup — it switches the dossier to that region's owning nation
+  (`setViewingId(ownerId)` in `GameScreen`); the manual "Inspect" selector and a map click both set
+  the same target and stay in sync. The owning nation is resolved from the authoritative `RegionMap`
+  by the feature's stable ISO_A3 code, which `applyRegions` stamps into `properties.regionId`
+  (properties survive into the rendered features) and the shared `regionOwner()` helper looks up.
+  It must **never** be read from the feature's top-level `id`: MapLibre repacks a GeoJSON source's
+  `id` into a numeric index when it stores the source, so at click/hover time `feature.id` is a
+  number, never the ISO_A3 (that repacking was the "no owner" bug, #6). Unowned regions (no
+  `RegionMap` entry) leave the current dossier target unchanged — never a broken dossier. The
+  hover path (a non-closeable tooltip with owner + key stats) uses the same resolution.
 - **Deterministic stub.** `server/stub.ts` answers the model contract deterministically per
   queued round item: each `action` item → one military/success event, each `diplomacy` item → one
   diplomatic/partial event, an empty round → one political "The world moves on" event. The player