terminal commands are silent when tmux runs them

tmux shows a hook's output and a non-zero exit in view mode over the pane.
the focus hook's normal outcomes (focus moved on, Ghostty not in front)
exited 1, and the one-second settling made "focus moved on" common:
"'dingger terminal focused --client ...' returned 1" kept covering panes.
`dingger terminal focused` and `terminal raise` now always exit 0 and
print nothing unless run by hand.

tmux::client_format checks that tmux answered for the client asked about:
for a client that is gone, tmux answers for the current one, so a raise
for a client that had just detached raised another client's terminal.

e2e step 20: no pane in view mode after the hook's failures, a gone
client raises nothing, and a focus held past the settling second; the old
code fails the new checks.

1 files changed, 6 insertions, 4 deletions

diff --git a/crates/dinggerd/src/tmux.rs b/crates/dinggerd/src/tmux.rs
index 54da39d..f69acd1 100644
--- a/crates/dinggerd/src/tmux.rs
+++ b/crates/dinggerd/src/tmux.rs
@@ -274,10 +274,12 @@ pub fn pane_format(pane_id: &str, format: &str) -> Option<String> {
 
 /// Expand a format in the context of a client (its current pane/window).
 pub fn client_format(client: &str, format: &str) -> Option<String> {
-    run_tmux(&["display-message", "-p", "-c", client, format])
-        .ok()
-        .map(|value| value.trim().to_string())
-        .filter(|value| !value.is_empty())
+    // For a client that is gone, tmux answers for the current one instead:
+    // the answer names its client, and must name this one.
+    let out = run_tmux(&["display-message", "-p", "-c", client, &format!("#{{client_name}}\t{format}")]).ok()?;
+    let (name, value) = out.trim_end_matches('\n').split_once('\t')?;
+    let value = value.trim();
+    (name == client && !value.is_empty()).then(|| value.to_string())
 }
 
 /// The sessions holding a pane's window (several: a session group, a linked