Fix CI typecheck: disable noUncheckedSideEffectImports

TS 5.9 enables noUncheckedSideEffectImports under strict mode, which
errors on CSS side-effect imports (e.g. leaflet/dist/leaflet.css).
These imports are resolved by bundlers (Vite/Metro), not tsc. Set
noUncheckedSideEffectImports: false in the shared tsconfig base.

Reverts the unnecessary leaflet devDependencies on the map package
since this base config fix handles it properly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/map/package.json

@@ -20,10 +20,5 @@
     "react-dom": ">=18",
     "leaflet": ">=1.9",
     "react-leaflet": ">=5"
-  },
-  "devDependencies": {
-    "@types/leaflet": "^1.9.21",
-    "leaflet": "^1.9.4",
-    "react-leaflet": "^5.0.0"
   }
 }

pnpm-lock.yaml

@@ -517,21 +517,17 @@ importers:
       '@trails-cool/map-core':
         specifier: workspace:*
         version: link:../map-core
+      leaflet:
+        specifier: '>=1.9'
+        version: 1.9.4
       react:
         specifier: '>=18'
         version: 19.2.5
       react-dom:
         specifier: '>=18'
         version: 19.2.5(react@19.2.5)
-    devDependencies:
-      '@types/leaflet':
-        specifier: ^1.9.21
-        version: 1.9.21
-      leaflet:
-        specifier: ^1.9.4
-        version: 1.9.4
       react-leaflet:
-        specifier: ^5.0.0
+        specifier: '>=5'
         version: 5.0.0(leaflet@1.9.4)(react-dom@19.2.5(react@19.2.5))(react@19.2.5)
 
   packages/map-core: {}

tsconfig.base.json

@@ -15,6 +15,7 @@
     "declarationMap": true,
     "sourceMap": true,
     "noUncheckedIndexedAccess": true,
+    "noUncheckedSideEffectImports": false,
     "noEmit": true,
     "allowImportingTsExtensions": true
   },