Feed writes: bulk OPML upsert, targeted fetch-result update, shared toggle

- AddFeedScreen: OPML import no longer crashes the app on a
  non-XML/corrupt file (try/catch around the whole import). Bulk
  upsertAll() instead of a per-feed getById()+upsert() loop -- 2N
  sequential DB round-trips for N feeds otherwise, real cost at 100+
  feed subscription lists.
- FeedDao.updateFetchResult only writes the columns a fetch actually
  produces, instead of a full-row @Update built from a feed snapshot
  read before a (possibly slow) network round-trip -- the old path
  could silently revert a readerModeEnabled/folder edit made via
  FeedListScreen while that feed's fetch was still in flight.
- setReaderModeEnabled(feed, enabled) persists the toggle and returns
  the exact confirmation text, shared by FeedListScreen's per-row
  toggle and ReaderScreen's toggleFeedReaderMode -- previously two
  independently-typed copies of the same snackbar message.

1 files changed, 3 insertions, 4 deletions

diff --git a/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt b/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt
index b586fbc..ae63258 100644
--- a/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt
+++ b/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt
@@ -62,6 +62,7 @@ import org.terst.feedreader.data.ArticleEntity
 import org.terst.feedreader.data.FeedEntity
 import org.terst.feedreader.data.ensureStandaloneArticle
 import org.terst.feedreader.data.saveArticleToStash
+import org.terst.feedreader.data.setReaderModeEnabled
 import org.terst.feedreader.readability.ReaderExtractor
 import java.net.URLEncoder
 
@@ -229,8 +230,7 @@ private fun ReaderContent(
         val newEnabled = !f.readerModeEnabled
         feed = f.copy(readerModeEnabled = newEnabled)
         scope.launch {
-            db.feedDao().update(f.copy(readerModeEnabled = newEnabled))
-            val feedLabel = f.title.ifBlank { "this feed" }
+            val message = db.feedDao().setReaderModeEnabled(f, newEnabled)
             if (newEnabled) {
                 if (readerContent == null) {
                     isExtracting = true
@@ -243,13 +243,12 @@ private fun ReaderContent(
                     }
                 }
                 isReaderMode = true
-                snackbarHostState.showSnackbar("Reader mode enabled for $feedLabel")
             } else {
                 isReaderMode = false
                 readerContent = null
                 db.articleDao().clearExtractedContent(articleId)
-                snackbarHostState.showSnackbar("Reader mode disabled for $feedLabel")
             }
+            snackbarHostState.showSnackbar(message)
         }
     }