fix(mobile): round Android Agents sheet corners

[PixPMusic]

Problem

The Android Agents popup's outer top edge and list content have square corners while the surrounding Material sheets use rounded surfaces. Open a thread's agent-count pill on Android to reproduce; it affects compact and split layouts.

Fixes #14920.

Change

Set the Android native sheet radius to 28 through the existing NativeStackScreenOptions, matching the Git sheets. Wrap the list in MaterialScreenContent with the established split-view horizontal inset.

Scope and approval

This qualifies for the very small, focused obvious-bug exception in CONTRIBUTING.md: it restores the established Material shape in one existing screen. No new capability, settings, or navigation behavior. The issue records the defect; it has not been maintainer-triaged.

The affected surface is Android mobile. The iOS rendering branch, web/desktop, providers, wire contracts, and local/remote connection behavior are unchanged.

Verification

• vp run --filter @t3tools/mobile typecheck passed.
• vp lint apps/mobile/src/features/threads/ThreadAgentsSheet.tsx passed.
• vp fmt --check apps/mobile/src/features/threads/ThreadAgentsSheet.tsx passed.
• Native Android 17 emulator: compact (1080×2424) and unfolded split (2076×2152). The popup outer edge and list now have rounded top corners; split mode has the existing Material horizontal inset. Dismissed and reopened the sheet, and opened a mock agent's child thread successfully.
• Matched captures below use the same three synthetic agents, theme, and device. A temporary UI roster fixture supplied the mock rows and was removed before committing. The environment label is Demo workstation; no personal hostname or conversation data appears. Screenshots are uploaded separately from the code branch.
• iOS was not exercised; its native sheet rendering is unchanged. No backend behavior changed.

Split layout

Before	After

Compact layout

Before	After

Model: GPT-6.1 Sol | Harness: Codex in T3 Code

[macroscopeapp]

Approvability

Verdict: Approved at 714a4a2

Macroscope's review found this PR approvable — This is a small, isolated Android UI bug fix that applies existing rounded-sheet primitives to the Agents sheet. It does not introduce new capabilities, alter data or navigation behavior, or affect iOS and backend paths.

^{You can add or adjust custom eligibility rules. Learn more.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Path: .coderabbit.config.ts
• Review profile: CHILL
• Plan: Advanced
• Run ID: a88b0bed-e3a6-4f33-a0e7-c41213f9975d

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📥 Commits

Reviewing files that changed from the base of the PR and between c6b6797 and 714a4a2.

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📒 Files selected for processing (1)

• apps/mobile/src/features/threads/ThreadAgentsSheet.tsx

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📝 Walkthrough

Walkthrough

The Android Agents sheet now uses MaterialScreenContent and a 28-point sheet corner radius. It enables horizontal inset when the adaptive workspace layout uses split view. The iOS rendering path is unchanged.

Changes

Agents sheet

Layer / File(s)	Summary
Apply Material content styling apps/mobile/src/features/threads/ThreadAgentsSheet.tsx	The sheet reads the adaptive workspace layout and wraps Android content in MaterialScreenContent. It sets a 28-point corner radius and enables horizontal inset in split view.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

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Merge Risk: ⚪ Minimal · up to 714a4

The Android Agents sheet now has split-aware insets and rounded corners, while the iOS path remains unchanged. No concrete issue prevents merging this focused visual correction.

Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: rounding Android Agents sheet corners.
Description check		The description includes all required sections. It explains the problem, the implementation, scope and approval basis, focused verification, platform coverage, and visual evidence.
Linked Issues check		The PR meets the coding requirements in issue #14920. ThreadAgentsSheet sets the Android native sheet radius to 28 and wraps the list in MaterialScreenContent. It passes the split-view horizontal-…
Out of Scope Changes check		The changes remain within issue #14920. They modify the existing Android Agents sheet presentation and layout only. The PR adds no feature, navigation behavior, provider capability, wire-contract chan…

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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Dismissing prior approval to re-evaluate 2c99dbd

[PixPMusic]

The CodeRabbit docstring-coverage warning does not call for a code change here. This fix only composes the existing MaterialScreenContent wrapper; its corner and inset behavior is already documented on that component. The existing Agents functions do not gain new semantics that need docstrings, and AGENTS.md asks us to keep documentation focused on information a maintainer cannot get from the source. All repository checks pass, and CodeRabbit reported no actionable code findings.

[PixPMusic]

this one also missed the top of the header rounding...

Dismissing prior approval to re-evaluate c6b6797

[PixPMusic]

Corrected the outer popup edge in the latest commit. The Android sheet now sets the same native sheetCornerRadius: 28 used by the Git sheets, alongside the rounded inner list. Replaced both after images with native captures showing the outer corners in compact and split layouts. Mobile typecheck and scoped checks pass; child-thread navigation was checked again.

[PixPMusic]

For maintainer review of the Macroscope eligibility result: this fixes the square outer header edge and inner content surface reported in #14920, using the existing Android Material treatment. sheetCornerRadius: 28 matches the Git sheets, and MaterialScreenContent is the existing shared wrapper. There are no new settings, workflows, navigation behavior, or iOS changes. The native before/after evidence now shows both edges in compact and split layouts.

This appears to fit the very small, focused fix for an obvious bug exception. The Macroscope correctness check and repository CI pass on c6b6797. Leaving the eligibility decision to maintainers; no approval or review was dismissed by this workflow.

[PixPMusic]

@juliusmarminge @maria-rcks This is rebased onto current main and ready for maintainer review. Mobile typecheck and scoped lint/format checks pass; existing before/after evidence is in the description.