[ymote]

OpenHarmony builds were the phone shell only: crates/shell/build.rs and phone/build.rs set mobile_only for target_env = "ohos" ("cannot host desktop processes"). Every native app is an in-process module on OpenHarmony, so the desktop runs there. On a MateBook Pro (HarmonyOS 7.0, API 26) all 13 dock apps open, including Terminal, and so do a YouTube video and its system browser.

Changes

• OCTOSENSE_OHOS_DESKTOP=1 (crates/shell/build.rs, phone/build.rs) builds the desktop shell for OpenHarmony. Without it nothing changes.
• build-home-ohos.py --desktop sets it and declares the module for 2in1 and tablet; a phone-only module runs in a phone-sized compatibility window on a 2-in-1. EntryAbility.ets maximizes the window on a 2-in-1.
• phone/Cargo.toml: an opt-in app-terminal feature. native-apps.json keeps Terminal off the phone shell.
• user_home(): the platform's data directory where it has one, so a new terminal opens in the app's folder rather than a HOME the app may not use.
• keyboard.patch: build-home-ohos.py applies it only while the framework's ArkTS bridge still drives the input method. With makepad's NDK input method there's no ArkTS keyboard code left to patch, so this works before and after the pin moves.

Depends on (for input, scroll, input method, web views, Terminal)

• openharmony: NDK input, native XComponent node, ArkWeb system browser makepad#90: OpenHarmony NDK input, native XComponent node, ArkWeb system browser
• terminal: run on OpenHarmony: app home, Ctrl+C, fonts by crate makepad#91: Terminal on OpenHarmony

Without them the desktop draws but takes no clicks on a 2-in-1. This PR doesn't move the makepad pin.

Checked

• cargo check --locked -p octosense, and -p octosense-home --features mobile-apps from phone/.
• tools/check-shell-graph.sh for both packages; rom unittests.
• octosense-shell tests (--features mobile-apps): 731 pass. 1 fails on my machine, sandbox::tests::a_jail_only_app_reads_its_jail_and_is_refused_everything_else: the jail probe can't start there. This branch doesn't touch the sandbox.
• On the MateBook Pro, through an equivalent Linux build (HarmonyOS command-line tools 6.1.1, AGC debug signing, makepad docs: AI services (octos): architecture, trust model, what apps can use today, ADR 0002 status #90/setup: make .sources/ worktrees of existing local clones #91 applied): dock launches, windows, typing, Terminal, scrolling, YouTube. build-home-ohos.py --desktop itself is unverified: it needs DevEco on macOS.

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