fix(desktop): stop spellcheck underlines on the composer

[Exotic209093]

Problem

The desktop composer inherits Chromium spellcheck, whose dictionary list is populated from the OS locale only (and an empty list falls back to en-US). T3 Code has no UI-language setting the dictionaries could be derived from, so any text typed in a language other than the OS locale gets underlined as misspelled (#7742).

Fix

Opt the composer's contenteditable out of spellcheck (spellCheck={false}). This matches existing precedent in the repo: every other input and textarea already passes spellCheck={false}, the mobile terminal input sets spellCheckingType = .no, and #2554 was previously closed as "composer disables spellcheck". One prop fixes both the desktop shell and any browser loading the same web client, without inventing new settings machinery or touching Electron internals.

A dictionary picker / spellcheck toggle would be a bigger product decision; happy to split that out if wanted.

Fixes #7742

ox-alpha via opencode

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Note

Low Risk
Tiny UI-only prop change on the composer; no auth, data, or editor logic impact.

Overview
Disables Chromium spellcheck on the composer ContentEditable so non-OS-locale text is no longer underlined as misspelled.

Sets spellCheck={false} on the prompt editor, matching other inputs in the app. There is no UI-language setting to drive dictionaries, so this is a one-prop opt-out rather than a new toggle.

^{Reviewed by Cursor Bugbot for commit 2d68318. Configure here.}

Note

Disable spellcheck on ContentEditable in ComposerPromptEditorInner

Sets spellCheck={false} on the ContentEditable element in ComposerPromptEditor.tsx to stop browser spellcheck underlines. The app currently lacks a UI-language concept, making the default spellchecker inaccurate.

^{Macroscope summarized 2d68318.}

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[macroscopeapp]

Approvability

Verdict: Approved at 2d68318

Macroscope's review found this PR approvable — This is a simple UI adjustment that disables spellcheck underlining on the composer input, matching existing patterns in the codebase. The change has no runtime behavior impact beyond visual presentation.

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