Read a timeout in units, share one usage answer, and let a tilde mean home

The composer's settings row is outlined bubbles opening round menus, and
the message box is a TextFieldValue so anything put into it without being
typed -- a draft, a share, a slash command -- leaves the cursor at the end.

A tap that puts a text selection away no longer also collapses the card the
text was drawn in: every open and close on the session screen goes through
one guard that spends such a press on the selection.

The usage bar and the usage dialog were two polls of one measurement and
disagreed for up to a minute at a time; they are one feed now, and the
countdown rounds up to the minute in the one place both read.

A working directory typed as ~/repos/ai-app was four literal characters on
the local transport and as an argument on both, so the existence check
refused every home-relative path. It is checked by entering the directory
now, expanded for a local spawn the way the remote shell expands it, and
stored short so the phone draws what somebody would write.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server/src/session/import.rs

@@ -441,7 +441,14 @@ pub async fn directory_exists(transport: &Transport, path: &str) -> bool {
     if path.is_empty() {
         return false;
     }
-    let launch = Launch::new("test", vec!["-d".to_string(), path.to_string()], None);
+    // Asked by *entering* it rather than by `test -d <path>`, because the
+    // question this is standing in for is "can a session start here" and
+    // because a path is only expanded where it is a working directory --
+    // `~/repos/ai-app` as an argument stays four literal characters on
+    // both transports (`ssh::quote_path`, `ssh::expand_home`), so the old
+    // form answered "no such directory" about every home-relative path
+    // somebody typed.
+    let launch = Launch::new("true", Vec::new(), Some(std::path::Path::new(path)));
     transport.capture(&launch).await.is_ok()
 }