Smooth scrolling, dark reader, mark-read-on-scroll, feed names, per-feed reader-mode opt-out

- ReaderScreen: AndroidView's update() was reloading the WebView's HTML on
  every recomposition (e.g. isSaving flipping mid-read), resetting scroll
  position -- this is what made scrolling feel unsmooth. Now only reloads
  when the content string actually changes.
- ReaderScreen: reader content now uses a hardcoded dark palette instead of
  browser-default white, matching the app's always-dark theme.
- ArticleListScreen: mark-as-read-on-scroll -- once an article has scrolled
  fully above the viewport it's marked read, the standard feed-reader
  behavior, via a new batched ArticleDao.markReadBatch(). Verified against
  the on-device DB (scrolled-past articles flipped to isRead=1, the
  still-visible one stayed unread).
- ArticleListItem/queries: LEFT JOIN feeds for a feedTitle column, shown per
  row in the Unread/Saved aggregated views and as a reader subtitle; the
  per-feed article list's top bar now shows the real feed title instead of
  a generic "Articles".
- FeedEntity.readerModeDisabled (schema v3, migration 2->3): per-feed
  opt-out of the Readability fallback/toggle, toggled from a new icon in
  FeedListScreen. Added for kottke.org specifically -- confirmed its thin
  linkblog posts were making Readability extract the page footer instead
  of the actual post; disabling reader mode for that feed now shows its
  own (short but correct) content instead.

All verified live on the emulator against the real 107-feed dataset.

1 files changed, 9 insertions, 2 deletions

diff --git a/app/src/main/java/org/terst/feedreader/data/AppDatabase.kt b/app/src/main/java/org/terst/feedreader/data/AppDatabase.kt
index e2f6c1a..4cf0ecd 100644
--- a/app/src/main/java/org/terst/feedreader/data/AppDatabase.kt
+++ b/app/src/main/java/org/terst/feedreader/data/AppDatabase.kt
@@ -9,7 +9,7 @@ import androidx.room.migration.Migration
 
 @Database(
     entities = [FeedEntity::class, ArticleEntity::class, FilterRuleEntity::class],
-    version = 2,
+    version = 3,
     exportSchema = false
 )
 abstract class AppDatabase : RoomDatabase() {
@@ -31,12 +31,19 @@ abstract class AppDatabase : RoomDatabase() {
             }
         }
 
+        // v3: added FeedEntity.readerModeDisabled (per-feed reader-mode opt-out).
+        private val MIGRATION_2_3 = object : Migration(2, 3) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL("ALTER TABLE feeds ADD COLUMN readerModeDisabled INTEGER NOT NULL DEFAULT 0")
+            }
+        }
+
         fun get(context: Context): AppDatabase = instance ?: synchronized(this) {
             instance ?: Room.databaseBuilder(
                 context.applicationContext,
                 AppDatabase::class.java,
                 "feedreader.db"
-            ).addMigrations(MIGRATION_1_2).build().also { instance = it }
+            ).addMigrations(MIGRATION_1_2, MIGRATION_2_3).build().also { instance = it }
         }
     }
 }