MAESTRO: audit viewer and display components - remove dead code

- ImageDiffViewer.tsx: Remove unused React import
- MermaidRenderer.tsx: Remove unused React import
- ThinkingStatusPill.tsx: Remove unused React import and debug console.log
- ThinkingStatusPill.test.tsx: Remove debug logging tests (no longer applicable)

src/__tests__/renderer/components/ThinkingStatusPill.test.tsx

@@ -90,17 +90,12 @@ function createThinkingSession(overrides: Partial<Session> = {}): Session {
 }
 
 describe('ThinkingStatusPill', () => {
-  let consoleSpy: ReturnType<typeof vi.spyOn>;
-
   beforeEach(() => {
     vi.useFakeTimers();
-    // Suppress console.log for debug logging in component
-    consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
   });
 
   afterEach(() => {
     vi.useRealTimers();
-    consoleSpy.mockRestore();
   });
 
   describe('render conditions', () => {
@@ -1332,48 +1327,6 @@ describe('ThinkingStatusPill', () => {
     });
   });
 
-  describe('debug logging', () => {
-    it('logs state check when busy sessions exist', () => {
-      const session = createThinkingSession();
-      render(
-        <ThinkingStatusPill
-          sessions={[session]}
-          theme={mockTheme}
-        />
-      );
-
-      // Console.log should have been called with state check info
-      expect(consoleSpy).toHaveBeenCalledWith(
-        '[ThinkingStatusPill] State check:',
-        expect.objectContaining({
-          thinkingCount: 1,
-          busySessionsCount: 1,
-        })
-      );
-    });
-
-    it('logs when sessions have busy tabs but session not busy', () => {
-      const busyTab = createMockAITab({ state: 'busy' });
-      const session = createMockSession({
-        state: 'idle', // Session is idle
-        aiTabs: [busyTab], // But has busy tab
-      });
-      render(
-        <ThinkingStatusPill
-          sessions={[session]}
-          theme={mockTheme}
-        />
-      );
-
-      expect(consoleSpy).toHaveBeenCalledWith(
-        '[ThinkingStatusPill] State check:',
-        expect.objectContaining({
-          sessionsWithBusyTabsCount: 1,
-        })
-      );
-    });
-  });
-
   describe('component display names', () => {
     it('ThinkingStatusPill has correct displayName', () => {
       expect(ThinkingStatusPill.displayName).toBe('ThinkingStatusPill');

src/renderer/components/ImageDiffViewer.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import { useState, useEffect } from 'react';
 import { ImageIcon, AlertCircle, Plus, Trash2 } from 'lucide-react';
 import type { Theme } from '../types';
 

src/renderer/components/MermaidRenderer.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useRef, useState } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import mermaid from 'mermaid';
 import DOMPurify from 'dompurify';
 

src/renderer/components/ThinkingStatusPill.tsx

@@ -5,7 +5,7 @@
  *
  * When AutoRun is active, shows a special AutoRun pill with total elapsed time instead.
  */
-import React, { memo, useState, useEffect } from 'react';
+import { memo, useState, useEffect } from 'react';
 import { GitBranch } from 'lucide-react';
 import type { Session, Theme, AITab, BatchRunState } from '../types';
 import { formatTokensCompact } from '../utils/formatters';
@@ -288,23 +288,6 @@ function ThinkingStatusPillInner({ sessions, theme, onSessionClick, namedSession
     s => s.state === 'busy' && s.busySource === 'ai'
   );
 
-  // DEBUG: Log all sessions' busy state to diagnose thinking pill disappearing
-  const busySessions = sessions.filter(s => s.state === 'busy');
-  const sessionsWithBusyTabs = sessions.filter(s => s.aiTabs?.some(t => t.state === 'busy'));
-  if (busySessions.length > 0 || sessionsWithBusyTabs.length > 0) {
-    console.log('[ThinkingStatusPill] State check:', {
-      thinkingCount: thinkingSessions.length,
-      busySessionsCount: busySessions.length,
-      sessionsWithBusyTabsCount: sessionsWithBusyTabs.length,
-      details: sessions.map(s => ({
-        id: s.id.substring(0, 8),
-        state: s.state,
-        busySource: s.busySource,
-        busyTabs: s.aiTabs?.filter(t => t.state === 'busy').map(t => t.id.substring(0, 8))
-      }))
-    });
-  }
-
   if (thinkingSessions.length === 0) {
     return null;
   }