[FEATURE]: Real-time spellcheck as you type

[AaLuckett]

Problem

Currently, opencode doesn't have integrated spellcheck. Users who want to catch spelling mistakes while typing have no built-in option and must rely on external tools or copy/paste to external spellcheckers.

Proposed Solution

Add an integrated spellcheck feature that checks text in real-time as users type in the input box, similar to how many IDEs and chat applications handle spellcheck.

Use Case

• Writers and developers who frequently type in opencode would benefit from immediate feedback on spelling errors
• Reduces friction of having to copy text elsewhere to check spelling
• Improves user experience for non-native English speakers

Suggested Implementation Options

1. OS-native spellcheck integration - Use macOS/Windows spellcheck APIs
2. Inline markers - Highlight misspelled words as they're typed
3. Suggestions popup - Show spelling suggestions on right-click or hover
4. Toggle option - Allow users to enable/disable via config

References

• VS Code has spellcheck extensions
• Many terminal emulators (iTerm2, Ghostty) can leverage OS spellcheck
• LanguageTool offers grammar checking as well

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• I have searched for existing issues that address this problem

[github-actions]

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[github-actions]

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[github-actions]

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