🤖 fix: disable native spellchecker in Electron windows

[ammar-agent]

Summary

Disable Electron's native spellchecker across the renderer windows. mux is a coding tool whose text inputs are full of code, file paths, and identifiers, so the OS spellchecker just produces noisy red squiggles with no value.

Implementation

Added spellcheck: false to webPreferences for:

• The main app window (src/desktop/main.ts) — where all chat/text input happens.
• The popped-out terminal window (src/desktop/terminalWindowManager.ts) — content is code.

The splash window has no text inputs, so it was left untouched. Per-element spellCheck={false} attributes that already existed on individual React inputs remain (now redundant but harmless).

Validation

• make static-check passes (eslint, typecheck for both app + main tsconfig projects, formatting, docs links).

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[ammar-agent]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

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