[ymote]

On Android the app IS the phone shell: full screen, one theme, no switcher. The desktop build stays universal unless it asks for the same shell.

Removed (under mobile_only)

• The desk bar: the style dropdown (Android ▾), the Desktop/Phone toggle, Light/Dark, the rotate button — the bar strip is not shown, the phone strip's drawing and its PhoneHit::{Rotate, Style, Appearance, Desktop} are compiled out, as are phone.desktop_size/_clients/_style (what Desktop restored), open_style_menu, the bar's Appearance/Style presses, the menu's "Desktop style" rows and NextStep's "Appearance" row, and the bar-metrics code.
• The desktop styles and iOS as things you can reach: startup is Android on every OS (policy::startup_style), nothing offers another style, and --test-action phone:<ios|android> is a logged no-op. The DesktopStyle enum itself stays — it is the hosted apps' wire-protocol style family and Android's sheet rides on it.
• Kept exactly as they were: status bar, home pages and glance page, drawer/App Library, Recents, shade, island, groups/pairs/split, keyboard, every gesture.

How it is gated

build.rs emits one cfg, mobile_only, when the mobile-only Cargo feature is on or CARGO_CFG_TARGET_OS == "android". The code reads #[cfg(mobile_only)] / crate::MOBILE_ONLY and never the feature or the target — so the condition is written once, cargo makepad android run (which cannot pass features) gets the standalone shell without flags, and plain cargo check stays the universal desktop. A default feature would have inverted every desktop invocation instead.

What moved

• Light/Dark → the shade's controls grid has a Dark mode tile (Toggle::DarkMode). It drives the same toggle_desktop_appearance path the bar used, so the shell and every hosted app follow; ShadeState::dark mirrors style.dark from set_desktop_style. (Also present in the universal build.)
• Rotation → the device's; the desktop mobile-only window has no rotate.
• Safe-area insets → PhoneState::insets, set from the window geometry: the wallpaper fills the desk, the shell (status bar, nav band, shade, apps) lays out inside insets.inset(desk). On the OnePlus in the buildtool's non-immersive mode the insets are zero and the window already sits between Android's status bar and gesture bar.

Verification

• cargo check, --features mobile-only, mobile-only,app-appcard, mobile-only,mobile-apps: all clean, no dead-code warnings.
• cargo test: 255 passed (universal); cargo test --features mobile-only: 252 passed (the three bar-metrics tests are gated with the bar).
• Desktop, --features mobile-only,mobile-apps: standalone-desktop.png (home fills the 412×892 window, no bar), standalone-shade-notes.png, standalone-shade-controls.png (Dark mode tile), standalone-glance.png, standalone-island.png, standalone-group.png, standalone-split.png, standalone-phone-noop.png.
• Desktop, universal: universal-desktop.png (Omarchy with the shell bar), universal-phone.png (phone style with its Android ▾ / Desktop / Light / ↻ strip still there).
• OnePlus 6T (1080×2340), cargo makepad android run --release with the bundled kernel: standalone-home.png (no bar, shell under Android's status bar, nav band above the gesture bar), standalone-shade-notes-phone.png, standalone-shade-controls-phone.png, standalone-shade-dark.png (tile toggled), standalone-dark.png (dark home), standalone-glance-phone.png, standalone-app.png (Reference opened, dark), standalone-home-dark.png (swipe up from the bottom → home). logcat: Shade(Notifications), Shade(Controls), Page(Right), Page(Left), HomeUp all commit; android-dark applied; no panics. Note the shade pull now starts in the top 42 pt of the app (y≈150 px), since the 48 pt bar above the status band is gone.

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[ymote]

Closing as superseded: every commit in this stack (#22–#28) is already on OctoSense-ROM main, where the phone shell continued. Per ADR 0001 the phone layer moves into the shared crates/shell from that copy when OctoSense-Desktop and OctoSense-ROM are merged into one OctoSense repository, so nothing here is lost. #25's octos-app pin is obsolete: AppCard now comes from OctoSense-System-Apps on octos main. The branches are kept.

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