feat(harmonyos): refine mobile UI and device navigation

[wgqqqqq]

Summary

• Align the mobile design contract around cleaner page surfaces, denser sheet geometry, consistent action controls, and regenerated Android, HarmonyOS, iOS, and preview projections.
• Refine HarmonyOS conversation, composer, sidebar, connection, account, settings, and sheet presentation with shared semantic controls and device-specific sidebar artwork.
• Improve remote device-directory interaction: compact selection keeps the sidebar visible, offline devices are disabled, refresh exposes a loading state, and a second tap collapses the workspace tree without disconnecting the remote target.

Type: UI/UX and bug fix

Areas: HarmonyOS mobile, mobile design system, generated Android/iOS design tokens

Motivation / Impact

The previous HarmonyOS mobile surface mixed floating control styles, duplicated sheet geometry, and sparse chat/composer proportions. Device-directory interactions also lacked refresh feedback and treated disclosure as a one-way selection. This change consolidates those visual facts in the mobile design contract and makes the remote sidebar behavior match its visible affordances.

Verification

• pnpm run mobile:ui:check — passed
• pnpm run mobile:architecture — passed
• pnpm run harmony:architecture — passed
• pnpm run theme:color-audit:all — passed
• source scripts/ohos-env.sh && "$HVIGORW" --mode module -p product=default -p module=entry@default assembleHap --no-daemon — passed
• source scripts/ohos-env.sh && "$HVIGORW" --mode module -p module=entry@default -p ohos.test.type=LocalTest test --no-daemon — passed
• ANDROID_HOME=/Users/user/Library/Android/sdk ANDROID_SDK_ROOT=/Users/user/Library/Android/sdk JAVA_HOME='/Applications/Android Studio.app/Contents/jbr/Contents/Home' ./gradlew :app:assembleDebug — passed
• ./Testing/run-pure-swift-tests.sh — passed
• HarmonyOS triple-fold emulator — verified compact device expand/collapse, disabled offline rows, refresh loading feedback, sidebar retention, and connected remote-target continuity.

Remote Scenarios

• Remote control: exercised on the HarmonyOS emulator against a connected desktop host.
• Remote workspace: not exercised; no workspace transport or path behavior changed.
• Peer Device Mode: not exercised; no HostInvoke, hydrate, or capability contract changed.
• Detached Dispatch: not exercised; no dispatch protocol or target runtime behavior changed.

Reviewer Notes

• AI-assisted change; build, unit, architecture, design-contract, theme-governance, and targeted emulator checks are recorded above.
• Local screenshots, recordings, research notes, and unused bitmap experiments were intentionally excluded from the commit.
• The initial Android invocation lacked SDK environment variables and stopped before source compilation; the explicit-environment command above completed successfully.

Checklist

• This PR is focused and does not include secrets, temporary prompts, generated scratch files, or unrelated artifacts.
• Relevant verification is recorded above, or skipped checks are explained.
• User-facing strings, docs, and locales are updated where applicable; this change reuses existing localized copy.

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