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/web/server/lib/opencode/proxy.js

@@ -50,7 +50,7 @@ export const normalizeForwardedDirectoryHeaders = (headers) => {
   return headers;
 };
 
-export const waitForSseDrain = (res, signal) => new Promise((resolve) => {
+const waitForSseDrain = (res, signal) => new Promise((resolve) => {
   if (signal?.aborted || res.writableEnded || res.destroyed) {
     resolve();
     return;
@@ -132,7 +132,7 @@ const SESSION_LIST_ALLOWED_FIELDS = [
   'project',
 ];
 
-export const sanitizeSessionListItem = (session) => {
+const sanitizeSessionListItem = (session) => {
   if (!session || typeof session !== 'object' || Array.isArray(session)) {
     return session;
   }
@@ -168,7 +168,7 @@ export const sanitizeSessionListItem = (session) => {
   return sanitized;
 };
 
-export const sanitizeSessionListPayload = (payload) => {
+const sanitizeSessionListPayload = (payload) => {
   if (!Array.isArray(payload)) {
     return payload;
   }