# Tabbed Station Libraries

## Task
Replace the single station list with a tabbed interface where every playlist gets its own tab, SomaFM is a built-in tab with listener-count sorting, and imported playlists become their own tabs automatically.

## Changes Made

### Data Model
- **Station.kt** -- Added `listenerCount: Int = 0` field for sort-by-listeners feature
- **Playlist.kt** -- Added `isBuiltIn: Boolean = false` to protect built-in playlists (SomaFM) from deletion

### Database
- **RadioDatabase.kt** -- Bumped to version 2, added `MIGRATION_1_2` that adds the new columns and seeds SomaFM data for existing installs
- **SomaFmSeedData.kt** -- Added listener counts to all 44 stations, set `isBuiltIn = true` on SomaFM playlist, extracted shared `seedStations()` function used by both `onCreate` and the migration
- **RadioApplication.kt** -- Registered `MIGRATION_1_2`

### UI
- **StationListScreen.kt** -- Complete restructure: `ScrollableTabRow` for tabs, `SortChipRow` with FilterChips (Default, A-Z, Z-A, Listeners), per-tab station list. Built-in tabs hide add/import/delete actions. Listener count shown inline on SomaFM stations. Long-press edit/delete disabled on built-in tab stations.
- **StationListViewModel.kt** -- New state model with `TabInfo`, `SortMode`, tab selection, and in-memory sorting. Import now creates a new playlist (tab) from the file name and assigns all parsed stations to it, then switches to the new tab.
- **AddStationDialog.kt** -- Simplified: removed playlist picker (stations go to current tab's playlist automatically)
- **EditStationDialog.kt** -- Simplified: removed playlist picker

## Follow-up Items
- Drag-and-drop reordering within tabs
- Tab reordering
- Renaming tabs/playlists