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Problem

UIKit can keep two iPad columns visible in narrower windows where the JavaScript layout switches to a single-column model. That leaves the detail empty and makes the sidebar safe area look inconsistent.

Change

Native workspace layouts follow UIKit's horizontal size class down to the combined 600-point column minimum. Generic layouts keep their existing breakpoints. The iPad sidebar surface extends under the status area without an extra system background or duplicate top inset.

The bottom-left navigation comes from layer 1: single-column layouts reserve a Compose slot, while two-column iPad layouts use the detail pane’s New Task action. Its position and width remain stable across destination changes, including full-width Usage and Settings.

Stack and review order

Layer 2 of 3; depends on #23841. Merge #23841 first. Layer 3 (#24206, Duo native search) depends on this branch.

• Logical base: feat/reorder-navigation-tabs (8e3ff73312).
• Review only this layer.
• This upstream PR targets main because GitHub cannot use its parent branch from the contributor fork as a base. Its default diff is cumulative until layer 1 merges. Rebase onto main after that merge; do not merge out of order.

Mobile only. No web/desktop navigation or search redesign.

Verification

• vp run check:changed: passed, including affected typechecks and focused tests.
• vp test run apps/mobile/src/lib/layout.test.ts: 11 passed, covering a 715-point regular-width window, the 600/599-point boundary, and compact size class collapse.
• Native iPad floating-window resize through wide, narrow regular, compact, and expanded states, with matched before/after screenshots and continuous recordings.
• Native iPad portrait and landscape captures in T3 Light, Ocean Dark, and Grove Dark; measured matching message-composer/navigation geometry in both orientations.

Current integrated iPad resize recording shows Compose beside the single-column tabs and the full-width tab bar in two columns. Native tab-switch recording verifies stable geometry across all four destinations. The comparisons below isolate this layer’s original column fix.

Current wide single-column layout

Earlier integrated capture (3af154d1ca): wide single-column window with Compose matching the navigation pill height and staying beside its edge. The historical comparisons below retain their original revisions.

Before / after

Captured on the iPadOS 27 simulator using Demo Workstation fixtures and T3 Light. The before revision is layer 1 (e4f974ee55); the after revision adds only this iPad layer (9e7323f22e). Both captures use the same floating window, orientation, theme, and list state.

At 681 points wide, UIKit still shows two columns. Before, JavaScript treats the workspace as compact and leaves the detail column blank. After, the detail content and sidebar navigation remain available. Below the column minimum, the workspace collapses to one column and expands again when resized wider.

Resized iPad window	Before	After
Narrow, regular size class

Identically cropped for readability. Full-device originals: before · after.

Before: continuous window resize recording · After: continuous window resize recording

Frames from the after recording

Wide: two columns	Narrow: detail stays visible	Compact: one column

The full-screen captures below additionally cover portrait, landscape, and three themes.

iPad landscape — three themes

Theme	Before	After
T3 Light
Ocean Dark
Grove Dark

iPad portrait — three themes

Theme	Before	After
T3 Light
Ocean Dark
Grove Dark

Current rebase validation

Rebased onto main at ff1f6fd884, including Julius’s UIKit-managed list insets (#24284) and fixed Duo Home/PR headers (#24295). Those four list implementations remain identical to main. Focused checks pass; the integrated native rerun is in progress. Earlier screenshots and recordings below retain their original capture revisions.

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

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• Source mode: Auto
• Repository: pingdotgg/t3code
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Reviewing files that changed from the base of the PR and between c4f264a and e06c857.

Files selected for processing: 1

• apps/mobile/src/Stack.tsx

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Walkthrough

The mobile workspace now supports configurable navigation-tab order and visibility, including Usage and Settings destinations. Android and iOS controls render configured tabs. Settings adds tab customization, and workspace screens and layouts adapt to tab selection and device state.

Changes: Mobile workspace navigation

Layer / File(s)	Summary
Tab preferences and customization apps/mobile/src/features/workspace/navigation-tab-order.ts, apps/mobile/src/features/workspace/navigation-tabs.ts, apps/mobile/src/persistence/mobile-preferences.ts, apps/mobile/src/features/settings/SettingsNavigationRouteScreen.tsx, apps/mobile/src/features/settings/SettingsRouteScreen.tsx, apps/mobile/src/Stack.tsx, apps/mobile/src/features/settings/components/SettingsEnvironmentFilterHeader.tsx, apps/mobile/src/features/settings/components/settings-sheet-targets.ts, apps/mobile/src/lib/storage.test.ts, apps/mobile/src/features/workspace/navigation-tab-order.test.ts, docs/user/usage.md	Tab order and visibility preferences are normalized and persisted. Settings adds controls to reorder, hide, show, and reset tabs, and lists overflow tabs. The settings stack registers the Navigation tabs screen.
Shared tab state and adaptive layout apps/mobile/src/features/workspace/workspace-tabs-state.ts, apps/mobile/src/features/workspace/WorkspaceTabsContext.tsx, apps/mobile/src/features/workspace/useSelectWorkspaceTab.ts, apps/mobile/src/features/workspace/workspace-tabs-state.test.ts, apps/mobile/src/features/home/home-thread-navigation.test.ts, apps/mobile/src/features/layout/*, apps/mobile/src/features/workspace/useSystemWorkspaceTabBar.ts, apps/mobile/src/features/workspace/useWorkspaceSurface.ts, apps/mobile/src/lib/layout.ts, apps/mobile/src/lib/layout.test.ts	Workspace state includes Usage and native slot mapping. Tab selection resolves against enabled tabs. Layout and split eligibility account for native workspace metrics, selected tabs, and device state.
Platform tab bars and selection apps/mobile/src/features/workspace/AndroidWorkspaceNavigation.android.tsx, apps/mobile/src/features/workspace/AndroidWorkspaceSidebar.android.tsx, apps/mobile/src/features/workspace/WorkspaceRootScreen.android.tsx, apps/mobile/src/features/workspace/WorkspaceNativeTabs.ios.tsx, apps/mobile/src/features/workspace/WorkspaceSidebarTabs*, apps/mobile/modules/t3-native-controls/android/src/main/java/expo/modules/t3nativecontrols/T3WorkspaceNavigationModule.kt, apps/mobile/modules/t3-native-controls/android/src/main/res/drawable/t3_usage.xml, apps/mobile/modules/t3-native-controls/ios/T3NativeControlsModule.swift, apps/mobile/modules/t3-native-controls/ios/T3SidebarTabBarView.swift	Android and iOS controls use tab IDs and selection. They render configured tabs and expose Compose actions under the configured conditions.
Workspace content, settings, and surfaces apps/mobile/src/features/workspace/WorkspaceRootScreen.tsx, apps/mobile/src/features/workspace/WorkspaceExtraTab.tsx, apps/mobile/src/features/workspace/WorkspaceNoTabs.tsx, apps/mobile/src/features/workspace/WorkspaceSectionToolbar.tsx, apps/mobile/src/features/workspace/WorkspaceToolbar.ios.tsx, apps/mobile/src/features/layout/WorkspaceEmptyDetail.tsx, apps/mobile/src/features/usage/UsageRouteScreen.tsx, apps/mobile/src/features/settings/components/SettingsScreen.tsx, apps/mobile/src/components/ui/ScreenScrollView.tsx, apps/mobile/src/native/*, apps/mobile/src/features/settings/SettingsRouteScreen.tsx	Workspace screens route extra tabs to Usage and show an empty state when no tabs are enabled. Settings and workspace surfaces apply tab- and device-specific header, background, and scroll-inset behavior.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant SettingsNavigationRouteScreen
  participant mobile_preferences
  participant navigation_tabs
  participant WorkspaceNativeTabs
  User->>SettingsNavigationRouteScreen: Change tab order or visibility
  SettingsNavigationRouteScreen->>mobile_preferences: Save preference update
  navigation_tabs->>mobile_preferences: Read saved tab preferences
  navigation_tabs->>WorkspaceNativeTabs: Provide enabled tabs and labels
  WorkspaceNativeTabs->>User: Render configured navigation tabs

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Possibly related PRs

• pingdotgg/t3code#23841: Adds Usage and Settings to mobile workspace navigation, which this PR extends with configurable tabs and layout changes.
• pingdotgg/t3code#24298: Adds split list and detail panes for wide Settings, using native workspace split-layout and SettingsSheet behavior also changed here.
• pingdotgg/t3code#24206: Changes controls that use the same native workspace layout assumptions.

Suggested reviewers: juliusmarminge, t3dotgg, macroscopeapp

Merge Risk: Low · up to e06c8

On an active iPad Thread detail page, New Task may not be visible; returning to the empty detail pane remains a workaround. This is a bounded navigation issue to accept or address before merging.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary change: keeping iPad workspace columns aligned during resizing.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The pull request description is complete and follows the required template. It explains the problem, implementation, scope, dependencies, mobile-only boundaries, focused tests, observed results, scree…

Full details: Description check

Explanation

The pull request description is complete and follows the required template. It explains the problem, implementation, scope, dependencies, mobile-only boundaries, focused tests, observed results, screenshots, recordings, and current validation status. It does not include an explicit maintainer approval comment, but the scope and review-order information are sufficiently documented.

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Actionable comments posted: 2

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at
@apps/mobile/src/features/layout/createWorkspaceStackNavigator.ios.tsx:
- Line 184: Update the detail header action selection around `detailCompose` so
`openNewTask` remains available when an iPad Thread detail route is active,
instead of being limited to the unfolded Duo case; preserve the existing
`selectedTab` behavior where it applies.

Review comments at @apps/mobile/src/Stack.tsx:
- Around line 963-964: Add a visible in-content close button to the root
Settings screen in the SettingsSheet flow, where the native back button and
outer stack header are hidden. Ensure it dismisses the sheet, and leave the card
animation and presentation-state handling unchanged.

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⚙️ Run configuration

• Source mode: Auto
• Repository: pingdotgg/t3code
• Branch: main
• File: .coderabbit.config.ts
• Commit: c8c9ccf
• Layers: Repository TS config
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• Run ID: d33eeabd-8ae4-4eac-8ee1-5a1913c41f76

📥 Commits

Reviewing files that changed from the base of the PR and between c8c9ccf and c4f264a.

📒 Files selected for processing: 46

• apps/mobile/modules/t3-native-controls/android/src/main/java/expo/modules/t3nativecontrols/T3WorkspaceNavigationModule.kt
• apps/mobile/modules/t3-native-controls/android/src/main/res/drawable/t3_usage.xml
• apps/mobile/modules/t3-native-controls/ios/T3NativeControlsModule.swift
• apps/mobile/modules/t3-native-controls/ios/T3SidebarTabBarView.swift
• apps/mobile/src/Stack.tsx
• apps/mobile/src/components/ui/ScreenScrollView.tsx
• apps/mobile/src/features/home/home-thread-navigation.test.ts
• apps/mobile/src/features/layout/AdaptiveWorkspaceLayout.tsx
• apps/mobile/src/features/layout/WorkspaceEmptyDetail.tsx
• apps/mobile/src/features/layout/adaptive-workspace-context.ts
• apps/mobile/src/features/layout/createWorkspaceStackNavigator.ios.tsx
• apps/mobile/src/features/layout/workspace-sidebar-toolbar.tsx
• apps/mobile/src/features/settings/SettingsNavigationRouteScreen.tsx
• apps/mobile/src/features/settings/SettingsRouteScreen.tsx
• apps/mobile/src/features/settings/components/SettingsEnvironmentFilterHeader.tsx
• apps/mobile/src/features/settings/components/SettingsScreen.tsx
• apps/mobile/src/features/settings/components/settings-sheet-targets.ts
• apps/mobile/src/features/usage/UsageRouteScreen.tsx
• apps/mobile/src/features/workspace/AndroidWorkspaceNavigation.android.tsx
• apps/mobile/src/features/workspace/AndroidWorkspaceSidebar.android.tsx
• apps/mobile/src/features/workspace/WorkspaceExtraTab.tsx
• apps/mobile/src/features/workspace/WorkspaceNativeTabs.ios.tsx
• apps/mobile/src/features/workspace/WorkspaceNoTabs.tsx
• apps/mobile/src/features/workspace/WorkspaceRootScreen.android.tsx
• apps/mobile/src/features/workspace/WorkspaceRootScreen.tsx
• apps/mobile/src/features/workspace/WorkspaceSectionToolbar.tsx
• apps/mobile/src/features/workspace/WorkspaceSidebarTabs.ios.tsx
• apps/mobile/src/features/workspace/WorkspaceSidebarTabs.tsx
• apps/mobile/src/features/workspace/WorkspaceTabsContext.tsx
• apps/mobile/src/features/workspace/WorkspaceToolbar.ios.tsx
• apps/mobile/src/features/workspace/navigation-tab-order.test.ts
• apps/mobile/src/features/workspace/navigation-tab-order.ts
• apps/mobile/src/features/workspace/navigation-tabs.ts
• apps/mobile/src/features/workspace/useSelectWorkspaceTab.ts
• apps/mobile/src/features/workspace/useSystemWorkspaceTabBar.ts
• apps/mobile/src/features/workspace/useWorkspaceSurface.ts
• apps/mobile/src/features/workspace/workspace-tabs-state.test.ts
• apps/mobile/src/features/workspace/workspace-tabs-state.ts
• apps/mobile/src/lib/layout.test.ts
• apps/mobile/src/lib/layout.ts
• apps/mobile/src/lib/storage.test.ts
• apps/mobile/src/native/NativeColumnContent.ios.tsx
• apps/mobile/src/native/V5StackHeader.ios.tsx
• apps/mobile/src/native/createV5StackNavigator.ios.tsx
• apps/mobile/src/persistence/mobile-preferences.ts
• docs/user/usage.md

💤 Files with no reviewable changes: 1

• apps/mobile/src/features/settings/components/SettingsEnvironmentFilterHeader.tsx

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Approvability

Verdict: Needs Human Approval

Macroscope's review found this PR requires human approval — This is a large cross-platform mobile navigation and workspace-layout change that adds persisted tab customization, promotes Usage into default workspace navigation, and modifies native iOS/Android controls and iPad column behavior. The product-default changes and broad production blast radius require human review.

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