feat(mobile): show no-trains warning in native bottom toolbar on iOS 26+

[guytepper]

On iOS 26+ the "no trains found for the requested time/date" warning on the route list now renders inside expo-router's native Stack.Toolbar with an orange-tinted Liquid Glass background, replacing the custom orange bottom sheet. Older iOS versions and Android keep the existing sheet and modal. The toolbar host has no intrinsic size, so the custom view gets an explicit width and height. The list's bottom padding was raised so the last route card scrolls clear of the taller toolbar.

Verified on an iOS 27 simulator.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-11T12:47:44.672020Z	c75bf39	PR opened

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: e4a4aa23-f42c-4a25-9d99-d00bf1ae5db3

📥 Commits

Reviewing files that changed from the base of the PR and between 10d134d and c75bf39.

📒 Files selected for processing (2)

• apps/mobile/src/screens/route-list/components/route-list-warning.tsx
• apps/mobile/src/screens/route-list/route-list-screen.tsx

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The route warning now uses a native toolbar with liquid glass on supported iOS versions and retains the bottom sheet fallback. Warning content is shared between both render paths. Route list padding now uses the theme spacing scale.

Changes

Route warning UI

Layer / File(s)	Summary
Conditional warning presentation apps/mobile/src/screens/route-list/components/route-list-warning.tsx	The component detects native toolbar support, extracts shared warning content, and renders either Stack.Toolbar with LiquidGlassView or the existing BottomScreenSheet.
Theme-based warning spacing apps/mobile/src/screens/route-list/route-list-screen.tsx	Warning-state list padding uses spacing[5] instead of the fixed value 12.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant RouteListWarning
  participant StackToolbar
  participant LiquidGlassView
  participant BottomScreenSheet
  RouteListWarning->>RouteListWarning: Check iOS and liquid glass support
  alt Native toolbar supported
    RouteListWarning->>StackToolbar: Render warning content
    StackToolbar->>LiquidGlassView: Render toolbar content
  else Native toolbar unsupported
    RouteListWarning->>BottomScreenSheet: Render warning content
  end

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Merge Risk: ⚪ Minimal · up to c75bf

The warning retains its fallback behavior on unsupported platforms while supported iOS versions receive the native toolbar presentation. No actionable merge risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: showing the no-trains warning in the native bottom toolbar on iOS 26 and later.
Description check	✅ Passed	The description directly explains the native toolbar change, platform-specific fallback behavior, sizing requirement, padding update, and verification.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

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