Update Card children to svelte 5

[deboer-tim]

Is your enhancement related to a problem? Please describe

Every build outputs the following deprecation warning:

[0] 9:22:10 a.m. [vite-plugin-svelte] src/lib/Card.svelte:26:6 Using `<slot>` to render parent content is deprecated. Use `{@render ...}` tags instead
[0] https://svelte.dev/e/slot_element_deprecated
[0] 24:     </div>
[0] 25:     <div class="flex overflow-hidden" role="region" aria-label="content">
[0] 26:       <slot name="content" />
[0]                                  ^
[0] 27:     </div>
[0] 28:   </div>

Describe the solution you'd like

The rest of Card is already using svelte 5, just update the child rendering.

Describe alternatives you've considered

No response

Additional context

No response