Lint: fix errors and remove unused variables

**Motivations:**
- Ensure lint config is not degraded and fix all lint errors for pousse workflow.

**Root causes:**
- Unused variables kept with _ prefix instead of removed (_row, _questReward, _i).
- getAnimalBlockOrigin had 5 parameters (max 4).
- use of continue statement (no-continue rule).

**Correctifs:**
- ESLint config verified; no eslint-disable in codebase.
- Removed unused variable _row (biome-rules); removed dead function _questReward (quests); removed unused map param _i (state.js).
- getAnimalBlockOrigin refactored to 4 params (pos object instead of x, y).
- Replaced continue with if (cell) block in normalizeLoadedCells (state.js).
- JSDoc param names aligned with _height, _y (biome-rules).

**Evolutions:**
- (none)

**Pages affectées:**
- web/js/biome-rules.js
- web/js/quests.js
- web/js/state.js
- web/js/placement.js

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "lint": "eslint web/js server --ignore-pattern '**/node_modules/**'",
     "lint:web": "eslint web/js",
-    "lint:server": "eslint server --ignore-pattern 'server/node_modules/**'"
+    "lint:server": "eslint server --ignore-pattern 'server/node_modules/**'",
+    "type-check": "npm run lint"
   },
   "devDependencies": {
     "eslint": "^9.15.0",