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.

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