Svelte Template Directives @attach (Svelte 5.29+) The reactive alternative to actions. Re-runs when dependencies change, passes through components via spread, supports cleanup functions. Quick Reference | Directive | Purpose | Reactive? | | ---------------- | ------------------------------ | --------- | | | DOM manipulation, 3rd-party | Yes | | | Render raw HTML strings | Yes | | | Render snippets | Yes | | | Local constants in blocks | N/A | | | Pause debugger on value change | N/A | | | Keyed iteration (always key!) | Yes | | | Window event listeners | N/A | @attach vs use: Actions | Featur…