T13: the right column's Git and Files switch, kept in settings; Files shows the shown session's folder as a tree, folders first, Git's marks on names from git status without optional locks, unreadable folders noted; a double press opens a folder, or a file in the system's app; it reloads when the session reports a folder, so at each prompt; a program without shell integration gets a line saying it reports no folder; header controls keep their presses from the header's double-press zoom

src/sessions.rs

@@ -20,6 +20,8 @@ pub struct Session {
     pub title: String,
     /// The folder it reports, else the one it started in.
     pub folder: PathBuf,
+    /// Its shell has integration, or it reported a folder anyway.
+    pub reports: bool,
     /// A bell rang while it was hidden.
     pub bell: bool,
     pub _events: Subscription,