Claude Code terminals should match the app's light/dark mode scheme

When the Claude Code app UI is in light or dark mode, the embedded terminal should automatically use the corresponding color scheme instead of defaulting to its own theme.\n\nExpected behavior:\n- App in light mode → terminal uses light theme\n- App in dark mode → terminal uses dark theme\n\nCurrent behavior:\nTerminal uses its own theme independent of the app's mode setting.\n\nWhy: Consistency across the IDE experience — the jarring theme switch when opening the terminal breaks immersion, especially for users who have dark mode enabled.