refactor(settings): simplify settings layout and controls

[maria-rcks]

What Changed

Simplified the settings page structure and reduced UI noise without changing the overall design language.

This updates the settings screen to use calmer grouped sections, simpler row layouts, lighter custom model management, and a top-bar Restore defaults action instead of reset controls inside the page body.

It also adds a small reusable improvement to the shared select component so settings dropdowns can render without the extra selected-item gutter.

Why

The previous settings UI had too many nested boxes, repeated action patterns, and too much visual weight for advanced or infrequently used options.

This keeps the page closer to the rest of the app and makes the common settings easier to scan.

UI Changes

Before

Screen.Recording.2026-03-21.at.8.17.54.PM.mov

After

Screen.Recording.2026-03-21.at.8.18.40.PM.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Restructure settings UI to support Claude and Codex CLI provider configuration

• Adds claudeBinaryPath to AppSettingsSchema and introduces getProviderStartOptions in appSettings.ts to build normalized provider overrides, returning undefined when none are set.
• Rewrites _chat.settings.tsx with new SettingsSection, SettingsRow, and SettingResetButton components, collapsible provider install panels for Codex and Claude, and a global 'Restore defaults' confirmation action.
• Converts 'Default thread mode' from a toggle to a dropdown select, and adds show-more/less and per-row remove controls to custom model management.
• Extends SelectItem in select.tsx with a hideIndicator prop that adjusts grid layout when the selection indicator is hidden.
• Behavioral Change: ChatView now uses getProviderStartOptions for dispatch, so provider overrides include Claude paths and pass undefined instead of an empty object when no overrides are set.

^{Macroscope summarized 3730235.}

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[maria-rcks]

I didn't touch the install path for codex section "codex install", i also think there should be one for claude? but if julius wants to give me ideas or just code it himself im all for it.

[UtkarshUsername]

Can't restore individual defaults now?

[maria-rcks]

@UtkarshUsername is it really needed to have a reset button appearing on each one? tried a select thing to reset but wasnt happy, if you have a better idea than just slapping a reset button everywhere, would love to hear.

[vishalHaridas]

I agree that individual restores are definitely useful, especially when options eventually grow.
Why not follow a minimal icon like Zed's IDE:
Default:

Changed:

[maria-rcks]

will update this later

[UtkarshUsername]

@UtkarshUsername is it really needed to have a reset button appearing on each one?

Yes, having that is helpful. Users might want different settings for, let's say theme and models.

tried a select thing to reset but wasnt happy, if you have a better idea than just slapping a reset button everywhere, would love to hear.

I like the UI shared by @vishalHaridas

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And one small nit-pick. The "Codex Install" chevron pointing towards right makes me feel as if it will open in a new page, but it is an accordion. So, can you change the orientation to point down when closed, and up when open. Like this:

[maria-rcks]

noted
will update once i get back

[vishalHaridas]

The new UI and behavior look amazing!!