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/settings/search.ts

@@ -2,7 +2,7 @@ import type { I18nKey } from '@/lib/i18n/store';
 import type { SettingsPageSlug, SettingsRuntimeContext } from './metadata';
 import { getSettingsPageMeta } from './metadata';
 
-export interface SettingsSearchItem {
+interface SettingsSearchItem {
   id: string;
   page: SettingsPageSlug;
   titleKey: I18nKey;
@@ -17,12 +17,12 @@ export interface SettingsSearchResult extends SettingsSearchItem {
   pageTitle: string;
 }
 
-export interface SettingsSearchAvailabilityContext extends SettingsRuntimeContext {
+interface SettingsSearchAvailabilityContext extends SettingsRuntimeContext {
   isMobile: boolean;
   isDesktopLocalOrigin: boolean;
 }
 
-export const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
+const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
   {
     id: 'appearance.language',
     page: 'appearance',