feat: add hunt page, combat placeholder, and Jagd navigation

Wires up Slice 0.2 end-to-end: HuntPageComponent renders the
hunting-unavailable/ready/loading/encounters-found states off
HuntingStore and WorldStore, Angreifen hands the HuntEncounter id to a
new inert CombatPlaceholderPageComponent via /combat/new, the Jagd nav
entry is enabled with router-driven active state (matching Karte's),
and the context panel now lists possible encounters for hunting-enabled
locations.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/src/app/layout/context-panel/context-panel.component.html

@@ -30,6 +30,12 @@
         <dt>Jagd</dt>
         <dd>{{ location.huntingEnabled ? 'Jagd möglich' : 'Keine Jagd' }}</dd>
       </div>
+      @if (location.huntingEnabled && location.possibleMonsters.length) {
+        <div>
+          <dt>Mögliche Begegnungen</dt>
+          <dd>{{ location.possibleMonsters.join(', ') }}</dd>
+        </div>
+      }
     </dl>
   } @else {
     <span class="context-panel__eyebrow">GEBIETSINFO</span>