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

web/js/texts-fr.js

@@ -98,6 +98,8 @@ export const weatherLabel = { sun: "Ensoleillé", cloudy: "Nuageux", rain: "Plui
 export const prestigeLabel = "Prestige (reset avec bonus permanent)";
 export const prestigeButton = "Réinitialiser (Prestige +%d)";
 export const prestigeHint = "Réinitialise tout et ajoute un bonus permanent de revenus. Coût min. : %d pièces.";
+export const seasonLabel = { spring: "Printemps", summer: "Été", autumn: "Automne", winter: "Hiver" };
+export const seasonChangeToast = "C'est le %s !";
 export const visitorsLabel = "Visiteurs";
 export const musicLabel = "Musique";
 export const incidentLabel = {