Quality of life: in-app dialogs, selections in the URL, editable widgets, token dialog, gallery search, status history, stream errors that say why, tab reordering and shortcuts, log out everywhere

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/auth/auth.go

@@ -146,6 +146,15 @@ func (s *Sessions) Valid(tok string) bool {
 	return ok
 }
 
+// DeleteAll ends every session on every device and says how many there were.
+func (s *Sessions) DeleteAll() (n int) {
+	_ = s.st.Update(func(state *store.State) {
+		n = len(state.Sessions)
+		state.Sessions = map[string]time.Time{}
+	})
+	return n
+}
+
 func (s *Sessions) Delete(tok string) {
 	_ = s.st.Update(func(state *store.State) { delete(state.Sessions, tok) })
 }