Addresses three review findings:
1. Coordinates now come straight from settingsRepo.stationPosition in the screen (collectAsStateWithLifecycle) — the exact same StateFlow the Settings page shows. Previously a separate ViewModel re-derived them, and it could lag behind the Settings page (user: '设置页更新了站位但漫游页死活不更新'). With the shared source the two pages can never disagree. RoamingViewModel removed; state derivation moved to RoamingState.fromPosition().
2. Red marker placement ported faithfully from the QTH定位器 app: it is driven by the 3rd character pair of the 8-char locator (the 'ih' in OL42ih45), mapped to a 0..1 fraction (lon a=west..x=east, lat inverted a=south..x=north), then scaled to the actual center-cell size. The grid now uses the reference proportions (columns 21.4/56.2/21.4, rows 31.5/35.9/31.7) and fills the screen, so the marker lands accurately on any device.
3. Workflow now uploads a versioned APK (look4sat-<version>.apk instead of look4sat.apk).
Also: Settings 'Other' card rows got vertical spacing (Arrangement.spacedBy) so the new roaming toggle is not glued to the night-mode row.
workflow_dispatch defaults TAG_NAME to the branch name (main), which breaks gh release create. Accept an optional tag_name input and fall back to github.ref_name for tag-triggered runs.
Remove Google Play upload (needs SERVICE_ACCOUNT_JSON we don't have) and AAB signing. Use built-in GITHUB_TOKEN instead of RELEASE_TOKEN secret. Pin actions to stable versions (checkout@v4, setup-java@v4, setup-gradle@v4). Builds assembleRelease, signs APK via apksigner with KEY_STORE secrets, creates GitHub release with APK. Triggered by v** tags.
mckero
Arty Bishop