perf(bundle): replace broad storage and utils imports

docs/performance-baseline.md

@@ -24,12 +24,19 @@ The command uses the built-in Next.js Turbopack analyzer and writes:
 
 Compressed sizes below are Turbopack module estimates. `Eager` is the route's synchronous client graph; `async` is code behind at least one dynamic import.
 
-| Route | Eager before | Eager baseline | Change | Async baseline |
+| Route | Before direct imports | Eager baseline | Change | Async baseline |
 | --- | ---: | ---: | ---: | ---: |
-| `/splash` | 644.4 KiB | 644.4 KiB | 0.0 KiB | 14.3 KiB |
-| `/chat` | 666.2 KiB | 666.2 KiB | 0.0 KiB | 14.7 KiB |
-| `/subscription` | 660.7 KiB | 657.0 KiB | -3.7 KiB | 20.7 KiB |
-| `/tip` | 653.9 KiB | 650.4 KiB | -3.5 KiB | 20.7 KiB |
+| `/splash` | 647.2 KiB | 646.2 KiB | -1.0 KiB | 14.3 KiB |
+| `/chat` | 670.5 KiB | 669.8 KiB | -0.7 KiB | 14.7 KiB |
+| `/subscription` | 660.1 KiB | 658.4 KiB | -1.7 KiB | 20.6 KiB |
+| `/tip` | 653.3 KiB | 651.6 KiB | -1.7 KiB | 20.6 KiB |
+
+The direct-import pass replaces root `@/utils` and `@/data/storage` barrel
+imports with symbol-level module paths. Turbopack already eliminated most unused
+barrel exports, so the immediate size reduction is modest. The explicit paths
+keep future barrel exports from silently expanding the client graph. Dexie and
+UA Parser remain in the analyzed routes through active feature dependencies and
+require separate feature-boundary work to remove from the eager graph.
 
 Module loading baseline: