feat: implement high-performance CSS-based ButtonAction component

frontend/src/components/ui/button_action.rs

@@ -0,0 +1,65 @@
+use leptos::prelude::*;
+use tailwind_fuse::tw_merge;
+use crate::components::ui::button::{Button, ButtonVariant};
+
+#[component]
+pub fn ButtonAction(
+    children: Children,
+    #[prop(into)] on_action: Callback<()>,
+    #[prop(optional, into)] class: String,
+    #[prop(default = 1000)] hold_duration: u64,
+    #[prop(default = ButtonVariant::Default)] variant: ButtonVariant,
+) -> impl IntoView {
+    let is_holding = RwSignal::new(false);
+    
+    let on_down = move |_| is_holding.set(true);
+    let on_up = move |_| is_holding.set(false);
+
+    Effect::new(move |_| {
+        if is_holding.get() {
+            leptos::task::spawn_local(async move {
+                gloo_timers::future::TimeoutFuture::new(hold_duration as u32).await;
+                if is_holding.get_untracked() {
+                    on_action.run(());
+                    is_holding.set(false);
+                }
+            });
+        }
+    });
+
+    let merged_class = move || tw_merge!(
+        "relative overflow-hidden transition-all active:scale-[0.98]",
+        class.clone()
+    );
+
+    view! {
+        <style>
+            "@keyframes button-hold-progress {
+                from { width: 0%; }
+                to { width: 100%; }
+            }
+            .animate-button-hold {
+                animation: button-hold-progress var(--button-hold-duration) linear forwards;
+            }"
+        </style>
+        <Button
+            variant=variant
+            class=merged_class()
+            attr:style=format!("--button-hold-duration: {}ms", hold_duration)
+            on:mousedown=on_down
+            on:mouseup=on_up
+            on:mouseleave=on_up
+            on:touchstart=move |_| is_holding.set(true)
+            on:touchend=on_up
+        >
+            // Progress Overlay
+            <Show when=move || is_holding.get()>
+                <div class="absolute inset-0 bg-white/20 dark:bg-black/20 pointer-events-none animate-button-hold" />
+            </Show>
+            
+            <span class="relative z-10 flex items-center justify-center gap-2">
+                {children()}
+            </span>
+        </Button>
+    }
+}

frontend/src/components/ui/mod.rs

@@ -2,6 +2,7 @@ pub mod accordion;
 pub mod alert_dialog;
 pub mod badge;
 pub mod button;
+pub mod button_action;
 pub mod card;
 pub mod checkbox;
 pub mod context_menu;