fix(leptos): resolve Phase 3 compilation errors

- Add PartialEq to MessageRecord and all nested types in shared-types
- Fix String references in view! macro by cloning owned values
- Fix match arm types with .into_any() in app.rs
- Clone on_load_more before FnMut closure in message_feed.rs
- Pre-compute class strings before passing to view! in message_card.rs
- Fix lifetime issues with imgs/vids/cats by using owned Vec<AttachmentRef>
- Use separate closures for different event types in mod.rs
- Fix disabled property to use signal pattern
- Fix filter chip closure signatures

services/frontend-leptos/frontend/src/features/messages/components/message_feed.rs

@@ -43,6 +43,7 @@ pub fn MessageFeed(
     create_effect(move |_| {
         let _ = intersecting.get(); // track signal
         if let Some(node) = sentinel_ref.get() {
+            let on_load_more = on_load_more.clone();
             let cb = Closure::<dyn Fn(Vec<JsValue>)>::new(move |entries: Vec<JsValue>| {
                 for entry in entries {
                     if let Some(entry) = entry.dyn_ref::<web_sys::IntersectionObserverEntry>() {