Reduce low-risk unused-symbol noise in core components (#316)

This first cleanup pass removes clearly unused imports and dead locals from a small set of components, and reconnects a few existing Props aliases to their component signatures so they stop surfacing as avoidable noise. The scope stays intentionally narrow to make the follow-up cleanup series easier to review and lower risk.

Constraint: Follow issue #314 with a components-only, low-risk first pass
Rejected: Broader sweep across commands/hooks/utils in the same PR | too much review surface for an initial cleanup pass
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep subsequent unused-code cleanups narrowly batched; treat signature/compatibility placeholders separately from straightforward import/alias cleanup
Tested: bun run build; bun run smoke; targeted noUnused grep for touched files via bun x tsc --noEmit --noUnusedLocals --noUnusedParameters --pretty false
Not-tested: full repo typecheck (baseline repo noise remains outside this narrow pass)

Co-authored-by: anandh8x <test@example.com>

src/components/App.tsx

@@ -1,5 +1,5 @@
 import { c as _c } from "react-compiler-runtime";
-import React from 'react';
+import type { ReactNode } from 'react';
 import { FpsMetricsProvider } from '../context/fpsMetrics.js';
 import { StatsProvider, type StatsStore } from '../context/stats.js';
 import { type AppState, AppStateProvider } from '../state/AppState.js';
@@ -9,14 +9,14 @@ type Props = {
   getFpsMetrics: () => FpsMetrics | undefined;
   stats?: StatsStore;
   initialState: AppState;
-  children: React.ReactNode;
+  children: ReactNode;
 };
 
 /**
  * Top-level wrapper for interactive sessions.
  * Provides FPS metrics, stats context, and app state to the component tree.
  */
-export function App(t0) {
+export function App(t0: Props) {
   const $ = _c(9);
   const {
     getFpsMetrics,