Review fixes: keep the keyboard off the settings form, and key the waits apart

The settings dialog was a dialog, so the platform moved it off the
keyboard; a screen is not, and the lower half of the form was under it.

A tool call registered its abandonable wait under the call's own id, which
the model chooses -- one named `generating` would have taken the turn's
entry and left the other wait with nobody to answer it.

server/src/session/llama/mod.rs

@@ -1433,7 +1433,9 @@ fn run_tool(
     // Read here rather than in the thread: the filter is live, and this is the
     // call it applies to.
     let chosen = shared.tools_wanted.lock().unwrap().clone();
-    awaiting(shared, &call.id, cancel, move || {
+    // Keyed apart from the turn's own wait, which the model could otherwise
+    // collide with by naming a call `generating`.
+    awaiting(shared, &format!("call:{}", call.id), cancel, move || {
         match tools.execute(&name, &arguments, cwd.as_deref(), &chosen) {
             Ok(output) => output,
             // Reaching the tool failed, which is this server's problem and not
@@ -1448,7 +1450,8 @@ fn run_tool(
 
 /// The id [`awaiting`] registers a completion under. One name is enough: a
 /// session runs one turn at a time, and an abandoned turn's entry is taken by
-/// the abandoning.
+/// the abandoning. A tool call's id is prefixed rather than used raw, so the
+/// model cannot name a call this and take the turn's own entry.
 const GENERATING: &str = "generating";
 
 /// Runs `work` on a thread of its own and waits for it in a way an interrupt