refactor: update type safety guidelines

Signed-off-by: Pedro Lamas <pedrolamas@gmail.com>

Author: pedrolamas

CLAUDE.md

@@ -182,6 +182,18 @@ src/
 - Use `consola` for logging, not `console.log` (configured in `src/setupConsola.ts` — warn in prod, verbose in dev)
 - Type imports: `import type { ... }` for types only (`verbatimModuleSyntax: true`)
 - `satisfies` keyword for store module type checking
+- No double-cast type assertions (`as unknown as T`) — use a proper TypeScript type guard instead (`in`, `typeof`, `instanceof`, or a custom type predicate):
+
+  ```typescript
+  // Bad
+  const x = value as unknown as { test: () => void }
+  x?.test?.()
+
+  // Good
+  if (value && 'test' in value && typeof value.test === 'function') {
+    value.test()
+  }
+  ```
 
 ## Git & Contribution Policy
 

src/store/layout/getters.ts

@@ -31,8 +31,11 @@ export const getters = {
     }
   },
 
-  isEnabledInLayout: (state, getters) => (layout: string, id: string): boolean => {
-    const configs = Object.values(getters.getLayout(layout) ?? {}).flat() as LayoutConfig[]
+  isEnabledInLayout: (state, getters) => (name: string, id: string): boolean => {
+    const layout: LayoutContainer | undefined = getters.getLayout(name)
+    const configs = layout
+      ? Object.values(layout).flat()
+      : []
 
     return configs.find(configs => configs.id === id)?.enabled ?? false
   },