feat: omit SQLite paths from sidebar labels

src/main.rs

@@ -41,6 +41,7 @@ Navigation:
   i             Show configured database info (Esc/Enter closes; passwords omitted)
   r             Refresh relations and the active relation
   Connected databases have a trailing * and show their tables/views beneath them.
+  SQLite sidebar entries show only the filename; the info window shows the full path.
   Enter on the connected database collapses/expands it without reconnecting.
   Keybindings float above the workspace; Up/Down/jk scroll, Home/End/g/G jump.
   Query Insert mode and connection/password fields keep ? as literal text.