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, 2 insertions, 1 deletions

diff --git a/app/src/main/java/org/terst/feedreader/data/Entities.kt b/app/src/main/java/org/terst/feedreader/data/Entities.kt
index 29d4fe4..f943f78 100644
--- a/app/src/main/java/org/terst/feedreader/data/Entities.kt
+++ b/app/src/main/java/org/terst/feedreader/data/Entities.kt
@@ -12,7 +12,8 @@ data class FeedEntity(
     val lastFetchedAt: Long? = null,
     val etag: String? = null,            // conditional-GET caching (If-None-Match) to avoid re-downloading unchanged feeds
     val lastModified: String? = null,    // conditional-GET caching (If-Modified-Since)
-    val lastError: String? = null        // set when a fetch fails; cleared on the next successful fetch
+    val lastError: String? = null,       // set when a fetch fails; cleared on the next successful fetch
+    val readerModeDisabled: Boolean = false // per-feed opt-out: never auto/manually switch to Readability for this feed's articles (e.g. a feed whose own formatting is better than what extraction produces)
 )
 
 @Entity(tableName = "articles")