Feature Request: Integrated Spell Check for Input

[Pirate7]

Is your feature request related to a problem? Please describe.
Yes. I have poor spelling skills, which makes drafting complex prompts in the terminal difficult. My current workaround is to type my prompts into the Gemini web interface (to catch typos) and then cut and paste them into the CLI. This workflow is inefficient and breaks the immersive experience of the tool. This feature would also be a significant accessibility improvement for developers who do not speak English as a primary language.

Describe the solution you'd like
I propose adding a lightweight spell-check functionality directly to the input loop.

• Architecture: We could utilize nspell and dictionary-en as dependencies.
• Logic: The tokenizer in src/ui/utils/highlight.ts could be updated to identify words within default tokens and check them against the dictionary, assigning a new 'misspelled' token type.
• UI: Update src/ui/components/InputPrompt.tsx to render these tokens with a visual cue (e.g., red underline) and handle interactions (like a mouse click) to display suggestions.
• Toggle: A configuration option in config.yaml to enable/disable this behavior.

Describe alternatives you've considered

• Current Workaround: Drafting in the Gemini Web App to verify spelling, then pasting into the terminal.
• External Editors: Using VS Code or Notepad, which creates context switching.

Additional context
I have an implementation plan drafted that involves hooking into parseInputForHighlighting for the logic and InputPrompt for the UI rendering. I am happy to share that or submit a PR if this approach sounds acceptable to the maintainers.