slskd: /soulseek search + downloads on the Workspace/Panel framework

Two panels (search + transfers) via WorkspaceView, coordinating over the
soulseek:refresh channel. Adds the page-title rule and documents the
route conventions in CLAUDE.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CLAUDE.md

@@ -183,6 +183,21 @@ type parameter and let inference flow from it.
 
 Commit messages: simple lowercase, no prefixes.
 
+## Frontend route conventions (apply to EVERY new dashboard route)
+
+Worked examples: `/soulseek`, `/music`, `/chat`.
+
+- **Workspace/Panel framework, always — never a standalone single screen.** The screen renders
+  `<WorkspaceView workspace={ws} locked />` where
+  `ws = useDashboardState<LayoutNode>('screens/<name>', defaultLayout)`, guarded by a `normalizeLayout`
+  that pins `appType`s to an allow-list. Panels are windowed apps under
+  `src/workspaces/officerdev/src/apps/<Feature>/`, each exporting `appRegistryMetas`
+  (`{ key, name, icon, component, availableOnPanel: false }`) and registered in `AppRegistry.tsx`.
+  Panels coordinate via `usePanelChannel`.
+- **Page title by route.** Add a rule to `RULES` in `src/apps/officer-web/state/usePageTitle.ts`
+  (`{ match: (p) => p.startsWith('/<name>'), title: '<Name>' }`, most-specific first);
+  `usePageTitleSync` does the rest.
+
 ## Further Reading
 
 - `CONVENTIONS.md` — component organisation, state management, React patterns, with rationale