chore: remove dead code (59 unused files + ~125 unused exports) (#1835)

* chore: remove dead/unreferenced files across ui, vscode

Remove 59 unused source files (components, hooks, lib utils, stores,
barrels, and orphaned vscode github modules) that are not imported by
any entry-reachable code. Also drop a stale test mock for the removed
execCommands module.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* refactor: remove unused exported symbols (types, functions, consts, hooks)

Remove exported symbols whose identifier is referenced nowhere in the
repository (verified via repo-wide search), across ui types/contracts,
lib utilities, sync layer, stores, and components. Also drop the few
imports/private helpers orphaned by these removals.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* refactor: remove more unused exports (desktop, shortcuts, worktree, vscode)

Continue removing repo-wide unreferenced exported functions, consts and
types across lib/desktop, shortcuts, worktreeSessionCreator, sync, and
vscode gitService, with cascading orphaned helpers/imports cleaned up.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* chore: add dead-code cleanup tooling

* refactor: checkpoint dead-code cleanup

* refactor: remove dead-code suppressions

---------

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>
Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/lib/router/index.ts

@@ -17,15 +17,12 @@
  * - `/?tab=diff&file=src/main.ts` - Open diff view with file
  */
 
-export type { RouteState, RouterContext } from './types';
-export { VALID_TABS, VALID_SETTINGS_SECTIONS, ROUTE_PARAMS } from './types';
+export type { RouteState } from './types';
+
 
 export { parseRoute, hasRouteParams } from './parseRoute';
 
 export type { AppRouteState } from './serializeRoute';
 export {
-  serializeRoute,
-  buildURL,
-  routeMatchesURL,
   updateBrowserURL,
 } from './serializeRoute';

packages/ui/src/lib/router/serializeRoute.ts

@@ -21,7 +21,7 @@ const DEFAULT_TAB: MainTab = 'chat';
  * Serialize application state to URL search parameters.
  * Only includes parameters that differ from defaults to keep URLs clean.
  */
-export function serializeRoute(state: AppRouteState): URLSearchParams {
+function serializeRoute(state: AppRouteState): URLSearchParams {
   const params = new URLSearchParams();
 
   // Session ID - always include if present
@@ -54,7 +54,7 @@ export function serializeRoute(state: AppRouteState): URLSearchParams {
  * Convert URLSearchParams to a URL string.
  * Returns just the pathname if no params, otherwise pathname + search string.
  */
-export function buildURL(params: URLSearchParams, pathname?: string): string {
+function buildURL(params: URLSearchParams, pathname?: string): string {
   const path = pathname ?? (typeof window !== 'undefined' ? window.location.pathname : '/');
   const search = params.toString();
 
@@ -69,7 +69,7 @@ export function buildURL(params: URLSearchParams, pathname?: string): string {
  * Check if the current URL matches the given route state.
  * Used to avoid unnecessary URL updates.
  */
-export function routeMatchesURL(state: AppRouteState): boolean {
+function routeMatchesURL(state: AppRouteState): boolean {
   if (typeof window === 'undefined') {
     return true;
   }

packages/ui/src/lib/router/types.ts

@@ -16,16 +16,6 @@ export interface RouteState {
   diffFile: string | null;
 }
 
-/**
- * Context for router operations - determines what capabilities are available.
- */
-export interface RouterContext {
-  /** Whether running in VS Code webview (limited URL capabilities) */
-  isVSCode: boolean;
-  /** Whether URL can be updated (false in VS Code, true elsewhere) */
-  canUpdateURL: boolean;
-}
-
 /**
  * Valid main tab values for URL routing.
  */