fix(zsh): only rename zellij tab when our pane is focused

`zellij action rename-tab` always targets the focused tab — there is
no CLI way to bind the rename to the calling pane. On session
resurrect zellij re-spawns every shell almost simultaneously while one
tab is focused, so every precmd hook fires and they all race to
rename that single focused tab; the last writer wins and the rest of
the tabs are stuck at `Tab #N`. This is the "all tabs got the same
label" bug from earlier.

Guard the rename hooks behind a focused-pane check using
`zellij action list-clients` (matches the `terminal_<ZELLIJ_PANE_ID>`
column). Background panes silently skip the rename and update lazily
the next time the user focuses them and a prompt fires. After
resurrect that means untouched tabs say `Tab #N` until you visit
them — but no tab gets a wrong label anymore.

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