feat(policies): backend-driven policy enforcement (frontend) (#6598)

## Summary
Adds the **Policies** feature (proprietary, behind the
`POLICIES_ENABLED` flag): backend-driven enforcement that runs a fixed
tool pipeline on documents, docked in the right tool sidebar alongside
Tools.

## Highlights
- **Policy catalog** — 5 categories; **Security** is wired (redact PII +
sanitize), the others are marked "Coming soon".
- **Backend as source of truth** — policies persist via the Policies
engine (`/api/v1/policies`), one policy per category, with a local cache
+ offline fallback.
- **Auto-run** — enabled policies run on every uploaded file: dispatch →
poll → import outputs into the workspace.
- **Security redact config** — PII preset dropdown + custom word/regex
entry + advanced options; tool params map to the backend endpoint
fields.
- **Activity feed** with retry on failures; **file badges** showing
which policies ran on a file (sidebar + files page), tinted to the
policy colour.
- Reuses the **Watched Folders** engine for each policy's backing
folder; policy-owned folders are filtered out of the Watched Folders UI.

## Notes
- Gated by `POLICIES_ENABLED` (true in proprietary, false in core) —
unreachable in the open-source build.
- Frontend-only diff; depends on the backend Policies engine and the
merged Watched Folders feature.

frontend/editor/vite.config.ts

@@ -203,6 +203,15 @@ export default defineConfig(async ({ mode }) => {
       }),
       compressStaticCopyPlugin(),
     ],
+    resolve: {
+      // Global alias so @shared resolves for ALL importers — including the
+      // shared components' own `@shared/components/X.css` self-imports, which
+      // live outside the editor tsconfig scope and so aren't rewritten by
+      // vite-tsconfig-paths. Required for the editor to consume SUI components.
+      alias: {
+        "@shared": path.resolve(__dirname, "../shared"),
+      },
+    },
     server: {
       host: true,
       // make sure this port matches the devUrl port in tauri.conf.json file