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/EffortPicker.tsx

@@ -1,18 +1,15 @@
-import React, { useState } from 'react'
+import type { ReactNode } from 'react'
 import { Box, Text } from '../ink.js'
 import { useMainLoopModel } from '../hooks/useMainLoopModel.js'
 import { useAppState, useSetAppState } from '../state/AppState.js'
-import type { EffortLevel, OpenAIEffortLevel } from '../utils/effort.js'
+import type { EffortLevel } from '../utils/effort.js'
 import {
   getAvailableEffortLevels,
   getDisplayedEffortLevel,
   getEffortLevelDescription,
   getEffortLevelLabel,
-  getEffortValueDescription,
   modelSupportsEffort,
   modelUsesOpenAIEffort,
-  standardEffortToOpenAI,
-  isOpenAIEffortLevel,
 } from '../utils/effort.js'
 import { getAPIProvider } from '../utils/model/providers.js'
 import { getReasoningEffortForModel } from '../services/api/providerConfig.js'
@@ -22,7 +19,7 @@ import { KeyboardShortcutHint } from './design-system/KeyboardShortcutHint.js'
 import { Byline } from './design-system/Byline.js'
 
 type EffortOption = {
-  label: React.ReactNode
+  label: ReactNode
   value: string
   description: string
   isAvailable: boolean
@@ -44,8 +41,6 @@ export function EffortPicker({ onSelect, onCancel }: Props) {
 
   // For OpenAI/Codex, get the model's default reasoning effort
   const modelReasoningEffort = usesOpenAIEffort ? getReasoningEffortForModel(model) : undefined
-  const defaultEffortForModel = modelReasoningEffort || currentDisplayedLevel
-
   const options: EffortOption[] = [
     {
       label: <EffortOptionLabel level="auto" text="Auto" isCurrent={false} />,