fix(mobile): use glass for pending cards

[t3-code]

What Changed

• use native Liquid Glass for pending approval and user-input cards on supported iOS
• keep an opaque fallback on unsupported platforms so thread content cannot bleed through

Why

This is an alternative implementation for #5450. Pending request cards should follow the current mobile glass surface pattern used by the composer instead of becoming opaque everywhere.

UI Changes

Captured from the real mobile showcase route on an iPhone 6.9-inch simulator in dark mode.

Before	After

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 (not applicable, no motion changes)

Model: GPT-5.4. Harness: T3 Code.

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Note

Low Risk
UI-only styling and animation tweaks for thread pending cards; no business logic, auth, or data handling changes.

Overview
Pending approval and user-input cards in the thread composer overlay now share a new PendingCardSurface wrapper instead of inline semi-transparent bordered Views.

On iOS where Liquid Glass is supported, that surface uses LiquidGlassView with a regular effect and light/dark colorScheme, matching the composer’s glass pattern. Elsewhere it falls back to a fully opaque rounded neutral card so thread content does not show through.

ThreadDetailScreen skips the FadeInDown enter animation on the pending-cards stack when glass is supported, consistent with other glass overlays in the app.

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Note

Use glass surface for pending cards in mobile thread detail

• Adds a new PendingCardSurface component that renders a LiquidGlassView on supported platforms (with dark/light color scheme), falling back to a themed bordered View otherwise.
• Updates PendingApprovalCard and PendingUserInputCard to use PendingCardSurface as their outer container.
• Disables the FadeInDown entry animation for pending cards when LiquidGlass is supported in ThreadDetailScreen.
• Behavioral Change: fallback card backgrounds no longer apply /80 opacity, and the entry animation is skipped on glass-supported platforms.

^{Macroscope summarized c6d5104.}

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Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Approved c6d5104

Pure UI styling change that introduces a glass visual effect for pending cards on supported devices, with proper fallback. No business logic affected, just presentational wrapper extraction and visual polish.

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