fix clicks from the menu bar app: find tmux without homebrew on PATH

launchd starts the menu bar app with PATH=/usr/bin:/bin:/usr/sbin:/sbin,
so the `dingger focus` it runs for every click (panel rows, menu rows, the
jump shortcut) could not find homebrew's tmux and failed with a misleading
"no tmux client attached"; the app discarded the error. dingger now finds
tmux on PATH or in the usual install locations (DINGGER_TMUX overrides),
reports a missing tmux as such, and the app logs failed jumps.

also: panel rows own every click inside them (labels took the clicks and
counted as window-drag background).

e2e step 14 repeats the menu bar row click and dingger focus under
launchd's environment; both fail with the previous binaries.

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/dinggerd/src/main.rs b/crates/dinggerd/src/main.rs
index 285f83a..3707d51 100644
--- a/crates/dinggerd/src/main.rs
+++ b/crates/dinggerd/src/main.rs
@@ -125,7 +125,7 @@ fn main() {
 /// by the watcher on its next tick). This is the single code path behind
 /// every click: the tmux status line and the menu bar rows.
 fn focus(client: Option<String>, pane: Option<String>) -> Result<(), String> {
-    let clients = tmux::clients();
+    let clients = tmux::clients()?;
     // The named client if it is attached; otherwise the most recently active
     // one (a click on the status line makes the clicking client the most
     // recent, so this is right even if the name did not expand).