chore: apply oxlint autofix (safe level)

Auto-fixed 102 warnings (6040 → 5938) across 57 files. Main categories:
- preserve-caught-error: add { cause: error } to re-thrown errors
- unicorn/no-array-reverse: .reverse() → .toReversed()
- unicorn/no-useless-fallback-in-spread: drop unnecessary ?? {} in spreads
- oxc/no-map-spread: rewrite object spread in .map() to Object.assign
- react-hooks/exhaustive-deps: trim module-level constants from dep arrays

Ran npm run format after to clean up whitespace from lint mutations.

packages/app/src/stores/checkout-git-actions-store.ts

@@ -53,7 +53,7 @@ function setStatus(
       statusByCheckout: {
         ...state.statusByCheckout,
         [key]: {
-          ...(state.statusByCheckout[key] ?? {}),
+          ...state.statusByCheckout[key],
           [actionId]: status,
         },
       },

packages/app/src/stores/workspace-layout-store.ts

@@ -531,7 +531,7 @@ export const useWorkspaceLayoutStore = create<WorkspaceLayoutStore>()(
           splitSizesByWorkspace: {
             ...state.splitSizesByWorkspace,
             [normalizedWorkspaceKey]: {
-              ...(state.splitSizesByWorkspace[normalizedWorkspaceKey] ?? {}),
+              ...state.splitSizesByWorkspace[normalizedWorkspaceKey],
               [normalizedGroupId]: clampNormalizedSizes(sizes),
             },
           },