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/chat/hooks/useChatTurnNavigation.ts

@@ -1,10 +1,10 @@
 import React from 'react';
 
-export type ChatHashTarget =
+type ChatHashTarget =
     | { kind: 'turn'; id: string }
     | { kind: 'message'; id: string };
 
-export const parseChatHashTarget = (hashValue: string): ChatHashTarget | null => {
+const parseChatHashTarget = (hashValue: string): ChatHashTarget | null => {
     const value = hashValue.startsWith('#') ? hashValue.slice(1) : hashValue;
     if (!value) {
         return null;
@@ -28,7 +28,7 @@ type TurnOffsetTarget =
     | { kind: 'resume' }
     | { kind: 'turn'; turnId: string };
 
-export const resolveTurnOffsetTarget = (
+const resolveTurnOffsetTarget = (
     turnIds: string[],
     activeTurnId: string | null,
     offset: number,

packages/ui/src/components/chat/hooks/useStreamingTextThrottle.ts

@@ -9,7 +9,7 @@ interface UseStreamingTextThrottleInput {
 
 const DEFAULT_STREAMING_TEXT_THROTTLE_MS = 100;
 
-export const computeStreamingThrottleDelay = (lastEmitAt: number, now: number, throttleMs: number): number => {
+const computeStreamingThrottleDelay = (lastEmitAt: number, now: number, throttleMs: number): number => {
     const elapsed = now - lastEmitAt;
     return Math.max(0, throttleMs - elapsed);
 };

packages/ui/src/components/chat/hooks/useTurnLookup.ts

@@ -1,26 +0,0 @@
-import React from 'react';
-import type { TurnProjectionResult } from '../lib/turns/types';
-
-export interface TurnLookupResult {
-    turnById: TurnProjectionResult['indexes']['turnById'];
-    messageToTurnId: TurnProjectionResult['indexes']['messageToTurnId'];
-    messageMetaById: TurnProjectionResult['indexes']['messageMetaById'];
-    getTurnByMessageId: (messageId: string) => TurnProjectionResult['turns'][number] | undefined;
-}
-
-export const useTurnLookup = (projection: TurnProjectionResult): TurnLookupResult => {
-    const getTurnByMessageId = React.useCallback((messageId: string) => {
-        const turnId = projection.indexes.messageToTurnId.get(messageId);
-        if (!turnId) {
-            return undefined;
-        }
-        return projection.indexes.turnById.get(turnId);
-    }, [projection.indexes.messageToTurnId, projection.indexes.turnById]);
-
-    return {
-        turnById: projection.indexes.turnById,
-        messageToTurnId: projection.indexes.messageToTurnId,
-        messageMetaById: projection.indexes.messageMetaById,
-        getTurnByMessageId,
-    };
-};