fix(web): model picker no longer shows a double border

[RakshithBhat03]

The model picker wrapped the same surface in two glass containers, leaving a doubled rounded border in both light and dark themes.

The popover now owns the glass background, border, clipping, and shadow. The picker content only controls layout, so the menu has one clean edge without changing its dimensions or selection behavior.

Verification

• vp lint apps/web/src/components/chat/ModelPickerContent.tsx apps/web/src/components/chat/ProviderModelPicker.tsx
• vp fmt --check apps/web/src/components/chat/ModelPickerContent.tsx apps/web/src/components/chat/ProviderModelPicker.tsx
• Verified the model picker locally in light and dark modes with before/after browser captures.
• vp run --filter @t3tools/web typecheck is currently blocked by pre-existing conditionalUI errors in apps/web/src/components/clerk/electronPasskeys.test.ts at lines 42 and 55.

Screenshots

Before	After
Light mode	Light mode
Dark mode	Dark mode

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Built by GPT-5.6 Sol in T3 Code through the Codex harness.

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Note

Low Risk
Pure CSS/layout tweak on the model picker popover. No logic, auth, or data-handling changes.

Overview
Stops the model picker from stacking two glass surfaces, which produced a doubled rounded border in light and dark themes.

ModelPickerContent now only handles layout. Glass background, border, clip, and shadow live on the popover viewport so the menu has a single clean edge without changing size or selection behavior.

^{Reviewed by Cursor Bugbot for commit ab57134. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Approved at ab57134

Macroscope's review found this PR approvable — This PR makes purely CSS class changes to fix a visual double-border bug in the model picker component. The modifications only affect styling with no runtime behavior impact, making this a straightforward low-risk UI fix.

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