fix: make guardian names deterministic per floor instead of using Math.random()

- generateGuardianName() now takes a floor parameter and uses floor % prefixes.length for deterministic prefix selection
- generateComboGuardianName() now takes a floor parameter and uses (floor + i) % prefixes.length for each element
- getGuardianForFloor() passes floor to generateGuardianName for static guardians with empty names
- getExtendedGuardian() passes floor to generateComboGuardianName for combo guardians
- Removes dependency on Math.random() → names are stable across ticks/refreshes

Fixes #161

src/lib/game/data/guardian-encounters.ts

@@ -36,19 +36,19 @@ const GUARDIAN_TITLES: string[] = [
   'Guardian', 'Sentinel', 'Champion', 'Overlord', 'Archon',
 ];
 
-export function generateGuardianName(element: string): string {
+export function generateGuardianName(element: string, floor: number = 0): string {
   const prefixes = GUARDIAN_PREFIXES[element] || ['Unknown'];
-  const prefix = prefixes[Math.floor(Math.random() * prefixes.length)];
-  const title = GUARDIAN_TITLES[Math.floor(Math.random() * GUARDIAN_TITLES.length)];
+  const prefix = prefixes[floor % prefixes.length];
+  const title = GUARDIAN_TITLES[Math.floor(floor / 10) % GUARDIAN_TITLES.length];
   return `${prefix} the ${title}`;
 }
 
-export function generateComboGuardianName(elements: string[]): string {
-  const parts = elements.map((el) => {
+export function generateComboGuardianName(elements: string[], floor: number = 0): string {
+  const parts = elements.map((el, i) => {
     const prefixes = GUARDIAN_PREFIXES[el] || ['Unknown'];
-    return prefixes[Math.floor(Math.random() * prefixes.length)];
+    return prefixes[(floor + i) % prefixes.length];
   });
-  const title = GUARDIAN_TITLES[Math.floor(Math.random() * GUARDIAN_TITLES.length)];
+  const title = GUARDIAN_TITLES[Math.floor(floor / 10) % GUARDIAN_TITLES.length];
   return `${parts.join('-')} the ${title}`;
 }
 
@@ -115,7 +115,7 @@ export function getExtendedGuardian(floor: number): GuardianDef | null {
     const g = getComboGuardian(floor);
     if (!g.name) {
       const elements = g.element.split('+');
-      g.name = generateComboGuardianName(elements);
+      g.name = generateComboGuardianName(elements, floor);
     }
     return g;
   }
@@ -129,7 +129,7 @@ export function getExtendedGuardian(floor: number): GuardianDef | null {
 export function getGuardianForFloor(floor: number): GuardianDef | null {
   if (BASE_GUARDIANS[floor]) {
     const g = { ...BASE_GUARDIANS[floor] };
-    if (!g.name) g.name = generateGuardianName(g.element);
+    if (!g.name) g.name = generateGuardianName(g.element, floor);
     return g;
   }
   return getExtendedGuardian(floor);