umputun / cronn / 19591028410

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feat: add neighbor instances selector for multi-server navigation (#56)

* feat: add neighbor instances selector for multi-server navigation

add optional server selector dropdown to hostname badge in web UI.
when configured via --web.neighbors-url, clicking the hostname opens
a dropdown with neighboring cronn instances for quick navigation.

supports both HTTP/HTTPS URLs and file:// paths for local JSON files.
includes 5-minute caching to reduce API calls.

* refactor: replace JS dropdown with HTMX details/summary pattern

- use native HTML details/summary for toggle behavior
- hx-get with hx-trigger="toggle once" for lazy loading
- server returns HTML fragment via template instead of JSON
- reduce neighbors JS from ~90 to ~15 lines (click-outside/ESC only)
- add server-side URL validation (http/https only)
- update tests for HTML responses

* fix: correct CSS selector for details open state

Change .neighbors-selector.open to .neighbors-selector[open] since
<details> elements use the [open] attribute, not a class.

Also document HTMX lazy-load dropdown pattern in CLAUDE.md.

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