Text-only bottom bar, re-extract action, fix YouTube thumbnails, verify Stash creds before saving

- Bottom bar: Previous/Keep unread/Next are now plain text labels, no icons
- Add "Re-download and re-extract" to the overflow menu (ReaderScreen and
  LinkReaderScreen) to force a fresh fetch + Readability pass on demand,
  overwriting whatever's cached
- Fix a real compile bug in the previous commit's reader-mode-off handler
  (passed null into a non-null setExtractedContent) via a proper
  clearExtractedContent() DAO query
- YouTube embeds: fixed the broken-image-glyph bug two ways -- (1) an
  11-char video-ID regex was accidentally matching a playlist embed's
  literal "videoseries" placeholder path, building a thumbnail URL for a
  video that doesn't exist, and (2) Readability's link-density cleanup was
  discarding the replacement entirely (a bare <a><img></a> reads as an
  ad/share unit). Restructured as a <figure>/<figcaption> pair -- the same
  shape a normal captioned photo takes -- confirmed live this survives
  extraction intact
- Stash settings: API key field is now a password field with a show/hide
  toggle, and "Verify and save" makes a real authenticated request before
  persisting anything, showing why it failed instead of silently saving
  bad credentials

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

1 files changed, 3 insertions, 0 deletions

diff --git a/app/src/main/java/org/terst/feedreader/data/Daos.kt b/app/src/main/java/org/terst/feedreader/data/Daos.kt
index 0b763e1..1f442e9 100644
--- a/app/src/main/java/org/terst/feedreader/data/Daos.kt
+++ b/app/src/main/java/org/terst/feedreader/data/Daos.kt
@@ -136,6 +136,9 @@ interface ArticleDao {
     @Query("UPDATE articles SET extractedContent = :content WHERE id = :id")
     suspend fun setExtractedContent(id: String, content: String)
 
+    @Query("UPDATE articles SET extractedContent = NULL WHERE id = :id")
+    suspend fun clearExtractedContent(id: String)
+
     @Query("UPDATE articles SET isSaved = :saved WHERE id = :id")
     suspend fun setSaved(id: String, saved: Boolean)