refactor: resolve structural inconsistencies and dead code

- Fix broken barrel exports in components/game/index.ts
- Remove skill system from stores (gameStore, gameActions, gameLoopActions, gameHooks, craftingStore, combat)
- Remove skill system from components (page.tsx, LeftPanel, StatsTab, SpellsTab, EnchantmentDesigner, EnchantmentPreparer, GameContext/Provider)
- Delete dead code: stats/ directory, attunements/ directory, layout/ Header+TabBar, shared/ StudyProgress+UpgradeDialog duplicates, effects.ts.fix, study-slice.ts, navigation-slice.ts
- Delete legacy store/ and store-modules/ directories, redirect remaining callers
- Merge root formatting.ts into utils/formatting.ts
- Move effects files (dynamic-compute, upgrade-effects, special-effects, upgrade-effects.types) into effects/ directory
- Move debug-context.tsx into components/game/debug/
- Create tabs/index.ts barrel for tab components
- Fix page.tsx lazy imports to use tabs barrel
- Fix all broken import paths across codebase
- Remove SKILLS_DEF and skill-evolution references
- Trim store.ts to under 400 lines by removing dead skill actions

docs/dependency-graph.json

@@ -1,26 +1,10 @@
 {
   "_meta": {
-    "generated": "2026-05-18T09:26:27.302Z",
+    "generated": "2026-05-18T10:08:42.124Z",
     "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."
   },
   "graph": {
-    "attunements/data.ts": [
-      "types.ts"
-    ],
-    "attunements/index.ts": [
-      "attunements/data.ts",
-      "attunements/types.ts",
-      "attunements/utils.ts"
-    ],
-    "attunements/types.ts": [],
-    "attunements/utils.ts": [
-      "attunements/data.ts",
-      "attunements/types.ts"
-    ],
-    "computed-stats.ts": [
-      "utils/index.ts"
-    ],
     "constants.ts": [
       "constants/index.ts"
     ],
@@ -379,9 +363,6 @@
       "types.ts",
       "utils/discipline-math.ts"
     ],
-    "formatting.ts": [
-      "computed-stats.ts"
-    ],
     "hooks/useGameDerived.ts": [
       "constants.ts",
       "special-effects.ts",
@@ -389,10 +370,6 @@
       "store/computed.ts",
       "upgrade-effects.ts"
     ],
-    "navigation-slice.ts": [
-      "computed-stats.ts",
-      "types.ts"
-    ],
     "special-effects.ts": [
       "upgrade-effects.types.ts"
     ],
@@ -528,10 +505,6 @@
       "store/crafting-modules/types.ts",
       "store/crafting-modules/utils.ts"
     ],
-    "store/index.ts": [
-      "store.ts",
-      "store/computed.ts"
-    ],
     "store/manaSlice.ts": [
       "constants.ts",
       "special-effects.ts",
@@ -578,18 +551,14 @@
     "stores/craftingStore.ts": [
       "crafting-actions/application-actions.ts",
       "crafting-actions/preparation-actions.ts",
-      "crafting-apply.ts",
       "crafting-design.ts",
       "crafting-equipment.ts",
+      "crafting-slice.ts",
       "crafting-utils.ts",
-      "special-effects.ts",
-      "store/crafting-modules/starting-equipment.ts",
       "stores/combatStore.ts",
-      "stores/gameStore.ts",
       "stores/manaStore.ts",
       "stores/uiStore.ts",
-      "types.ts",
-      "upgrade-effects.ts"
+      "types.ts"
     ],
     "stores/discipline-slice.ts": [
       "data/disciplines/base.ts",
@@ -604,7 +573,6 @@
       "stores/manaStore.ts",
       "stores/prestigeStore.ts",
       "stores/uiStore.ts",
-      "upgrade-effects.ts",
       "utils/index.ts"
     ],
     "stores/gameHooks.ts": [
@@ -637,7 +605,6 @@
       "stores/manaStore.ts",
       "stores/prestigeStore.ts",
       "stores/uiStore.ts",
-      "upgrade-effects.ts",
       "utils/index.ts"
     ],
     "stores/index.ts": [
@@ -662,12 +629,6 @@
       "types.ts"
     ],
     "stores/uiStore.ts": [],
-    "study-slice.ts": [
-      "constants.ts",
-      "special-effects.ts",
-      "types.ts",
-      "upgrade-effects.ts"
-    ],
     "types.ts": [
       "data/equipment/types.ts",
       "types/attunements.ts",