test: add unit tests for core game logic utilities

Add 5 new test files covering pure utility functions:
- discipline-math.test.ts (42 tests): stat bonus, mana drain, perk tiers,
  discipline activation/progression, unlocked perks, discipline stats
- formatting.test.ts (35 tests): fmt, fmtDec, formatSpellCost,
  getSpellCostColor, formatStudyTime, formatHour
- floor-utils.test.ts (13 tests): getFloorMaxHP, getFloorElement
- combat-utils.test.ts (37 tests): getElementalBonus, getBoonBonuses,
  getIncursionStrength, canAffordSpellCost, deductSpellCost
- mana-utils.test.ts (36 tests): computeMaxMana, computeRegen,
  computeClickMana, getMeditationBonus, computeEffectiveRegenForDisplay

Total: 163 new tests, all passing. No existing tests broken.

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-05-20T10:00:49.725Z",
+    "generated": "2026-05-20T10:36:02.953Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },
@@ -156,25 +156,6 @@
       "crafting-utils.ts",
       "types.ts"
     ],
-    "crafting-slice.ts": [
-      "constants.ts",
-      "crafting-actions/index.ts",
-      "crafting-apply.ts",
-      "crafting-attunements.ts",
-      "crafting-design.ts",
-      "crafting-equipment.ts",
-      "crafting-loot.ts",
-      "crafting-prep.ts",
-      "crafting-utils.ts",
-      "data/attunements.ts",
-      "data/crafting-recipes.ts",
-      "data/enchantment-effects.ts",
-      "data/equipment/index.ts",
-      "effects/special-effects.ts",
-      "effects/upgrade-effects.ts",
-      "effects/upgrade-effects.types.ts",
-      "types.ts"
-    ],
     "crafting-utils.ts": [
       "data/crafting-recipes.ts",
       "data/enchantment-effects.ts",
@@ -415,15 +396,6 @@
       "utils/index.ts",
       "utils/pact-utils.ts"
     ],
-    "store.ts": [
-      "types.ts",
-      "utils/activity-log.ts",
-      "utils/combat-utils.ts",
-      "utils/floor-utils.ts",
-      "utils/formatting.ts",
-      "utils/mana-utils.ts",
-      "utils/room-utils.ts"
-    ],
     "stores/attunementStore.ts": [
       "data/attunements.ts",
       "types.ts"
@@ -454,7 +426,6 @@
       "crafting-actions/preparation-actions.ts",
       "crafting-design.ts",
       "crafting-equipment.ts",
-      "crafting-slice.ts",
       "crafting-utils.ts",
       "stores/combatStore.ts",
       "stores/craftingStore.types.ts",
@@ -529,6 +500,7 @@
       "stores/combat-state.types.ts",
       "stores/combatStore.ts",
       "stores/craftingStore.ts",
+      "stores/craftingStore.types.ts",
       "stores/discipline-slice.ts",
       "stores/gameHooks.ts",
       "stores/gameStore.ts",