sl0p: bring zj-pane-finder into the repo

The pane finder was living in ~/dev with no version control at all, while
path-depending on this checkout's zellij-tile -- so the plugin and the binary
it must stay API-compatible with were maintained in two unrelated places, one
of them unversioned.

Its own workspace root rather than a member of zellij's: a non-root member has
its [profile] ignored, and opt-level="z" + lto + strip are what keep the wasm
small, which matters because the keybinding loads it with skip_plugin_cache and
recompiles on every launch. Staying independent also means carrying this crate
touches no upstream-tracked file, so it cannot conflict on a rebase.

install.sh no longer assumes ./target: this checkout's .cargo/config.toml sets
a shared build.target-dir, so the artifact lands in the repo's target dir
instead. It now asks cargo metadata where the build actually went, and fails
loudly rather than silently installing a stale wasm.

The zellij-tile path dep becomes relative, so the crate builds from any
checkout rather than only from /home/user/lol/zellij.

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