Trigger rebuilds on both [web.watcher].watch_path (in the config but not wired up) and cargo's depinfo (#5042)

* fix: wire up [web.watcher].watch_path config to file watcher

- The watch_path config field was added but never consumed after the CLI rewrite in PR #3797
- Now watches additional paths specified in Dioxus.toml [web.watcher].watch_path

* fix: trigger rebuild for files under depinfo directories

- When cargo:rerun-if-changed=dir is used, the depinfo contains the directory path
- Now checks if changed files are under any depinfo directory, not just exact matches