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/components/sections/mcp/McpSidebar.tsx

@@ -384,5 +384,5 @@ export const McpSidebar: React.FC<McpSidebarProps> = ({ onItemSelect }) => {
 };
 
 // Re-export for easy sidebar icon usage
-export { McpIcon } from '@/components/icons/McpIcon';
+
 import { Icon } from "@/components/icon/Icon";

packages/ui/src/components/sections/mcp/mcpImport.ts

@@ -17,7 +17,7 @@ export interface ImportedMcpResult {
   readonly enabled: boolean;
 }
 
-export type ImportedMcpError =
+type ImportedMcpError =
   | { readonly ok: false; readonly error: string }
   | { readonly ok: false; readonly error: string; readonly parsed: unknown };
 

packages/ui/src/components/sections/mcp/mcpOAuth.ts

@@ -53,7 +53,7 @@ export const parseMcpOAuthCallbackStateKey = (params: URLSearchParams): string |
   return trimmed || null;
 };
 
-export const parseMcpOAuthState = (raw: string | null | undefined): {
+const parseMcpOAuthState = (raw: string | null | undefined): {
   name: string;
   directory: string | null;
 } | null => {