feat(SidebarMenu): create a shared sidebar menu that slides to the screen

src/shared/ui/SidebarMenu/SidebarMenu.svelte

@@ -0,0 +1,99 @@
+<!--
+    Component: SidebarMenu
+    Slides out from the right, closes on click outside
+-->
+<script lang="ts">
+import { cn } from '$shared/shadcn/utils/shadcn-utils';
+import type { Snippet } from 'svelte';
+import { cubicOut } from 'svelte/easing';
+import {
+    fade,
+    slide,
+} from 'svelte/transition';
+
+interface Props {
+    /**
+     * Children to render conditionally
+     */
+    children?: Snippet;
+    /**
+     * Action (always visible) to render
+     */
+    action?: Snippet;
+    /**
+     * Wrapper reference to bind
+     */
+    wrapper?: HTMLElement | null;
+    /**
+     * Class to add to the wrapper
+     */
+    class?: string;
+    /**
+     * Bindable visibility flag
+     */
+    visible?: boolean;
+    /**
+     * Handler for click outside
+     */
+    onClickOutside?: () => void;
+}
+
+let {
+    children,
+    action,
+    wrapper = $bindable<HTMLElement | null>(null),
+    class: className,
+    visible = $bindable(false),
+    onClickOutside,
+}: Props = $props();
+
+/**
+ * Closes menu on click outside
+ */
+function handleClick(event: MouseEvent) {
+    if (!wrapper || !visible) {
+        return;
+    }
+    if (!wrapper.contains(event.target as Node)) {
+        visible = false;
+        onClickOutside?.();
+    }
+}
+</script>
+
+<svelte:window on:click={handleClick} />
+
+<div
+    class={cn(
+        'transition-all duration-300 delay-200 cubic-bezier-out',
+        className,
+    )}
+    bind:this={wrapper}
+>
+    {@render action?.()}
+    {#if visible}
+        <div
+            class="relative z-20 h-full w-auto flex flex-col gap-4"
+            in:fade={{ duration: 300, delay: 400, easing: cubicOut }}
+            out:fade={{ duration: 150, easing: cubicOut }}
+        >
+            {@render children?.()}
+        </div>
+
+        <!-- Background Gradient -->
+        <div
+            class="
+                absolute inset-0 z-10 h-full transition-all duration-700
+                bg-linear-to-r from-white/75 via-white/45 to-white/10
+                bg-[radial-gradient(ellipse_at_left,_rgba(255,252,245,0.4)_0%,_transparent_70%)]
+                shadow-[_inset_-1px_0_0_rgba(0,0,0,0.04)]
+                border-r border-white/90
+                after:absolute after:right-[-1px] after:top-0 after:h-full after:w-[1px] after:bg-black/[0.05]
+                backdrop-blur-md
+            "
+            in:slide={{ axis: 'x', duration: 250, delay: 100, easing: cubicOut }}
+            out:slide={{ axis: 'x', duration: 150, easing: cubicOut }}
+        >
+        </div>
+    {/if}
+</div>