feat: add auto copy on select

[liamhess]

Fixes #1193 by adding auto copy on selection.

[vercel]

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[greptile-apps]

Greptile Summary

Adds optional auto-copy on selection feature to the terminal, allowing users to automatically copy selected text to clipboard. The implementation includes:

• New autoCopyOnSelection boolean setting (defaults to false for opt-in behavior)
• Settings UI with toggle switch in Terminal Settings Card
• Event-based communication between settings and terminal manager
• 150ms debounce to prevent excessive clipboard operations during text selection
• Reuses existing copySelectionToClipboard() method which handles ANSI code cleanup and fallback strategies
• Proper cleanup of debounce timers and event listeners in disposables

The feature is well-isolated, properly initialized from settings, and updates immediately when toggled.

Confidence Score: 5/5

• This PR is safe to merge with no issues identified
• Clean implementation following established patterns, proper error handling, memory-safe with timer cleanup, opt-in behavior, reuses existing clipboard methods, no breaking changes
• No files require special attention

Important Files Changed

Filename	Overview
src/main/settings.ts	Added autoCopyOnSelection boolean field to terminal settings with proper defaults and normalization
src/renderer/components/TerminalSettingsCard.tsx	Added Switch UI component for auto-copy setting with proper state management and event dispatching
src/renderer/terminal/TerminalSessionManager.ts	Implemented auto-copy functionality with 150ms debounce, proper event handling, and cleanup in disposables
src/renderer/types/electron-api.d.ts	Updated TypeScript definitions to include autoCopyOnSelection field in terminal settings types

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User selects text in terminal] --> B{Auto-copy enabled?}
    B -->|No| Z[End - no action]
    B -->|Yes| C{Has selection?}
    C -->|No| Z
    C -->|Yes| D[Clear existing debounce timer]
    D --> E[Start 150ms debounce timer]
    E --> F{Timer expires}
    F --> G{Terminal disposed?}
    G -->|Yes| Z
    G -->|No| H{Still has selection?}
    H -->|No| Z
    H -->|Yes| I[Get selected text]
    I --> J[Clean terminal text<br/>remove ANSI codes]
    J --> K{navigator.clipboard available?}
    K -->|Yes| L[Copy via navigator.clipboard]
    K -->|No| M[Copy via electronAPI fallback]
    L --> N[Success]
    M --> N
    L -.->|Error| M
    N --> Z

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_{Last reviewed commit: 00fae83}

[arnestrickmann]

Hi @liamhess,

Thanks for opening the PR - the addition makes sense.

LGTM, merging.