Lib: Move form stuff into form/ directory

src/lib/components/form/Button.svelte

@@ -0,0 +1,75 @@
+<script lang="ts">
+  import { page } from "$app/stores";
+  import type { Snippet } from "svelte";
+  import type { HTMLButtonAttributes } from "svelte/elements";
+  import { popup, type PopupSettings } from "@skeletonlabs/skeleton";
+
+  const is_at_path = (path: string): boolean => {
+    const pathname: string = $page.url.pathname;
+    // console.log(pathname);
+    return pathname === path;
+  };
+
+  interface ButtonProps extends HTMLButtonAttributes {
+    children: Snippet;
+
+    /** The main color variant, e.g. "primary" or "secondary". */
+    color?: string | undefined;
+
+    /** Set the button type to "submit" (otherwise "button"). Only if "href" is undefined. */
+    submit?: boolean;
+
+    /** Make the button act as a link. */
+    href?: string | undefined;
+
+    /** Add a width class to the button. */
+    width?: string;
+
+    /** Enable the button's ":hover" state manually. */
+    activate?: boolean;
+
+    /** Enable the button's ":hover" state if the current URL matches the "href". Only if "href" is defined. */
+    activate_href?: boolean;
+
+    /** The PopupSettings to trigger on click. Only if "href" is undefined. */
+    trigger_popup?: PopupSettings;
+  }
+
+  let {
+    children,
+    color = undefined,
+    submit = false,
+    href = undefined,
+    width = "w-auto",
+    activate = false,
+    activate_href = false,
+    trigger_popup = { event: "click", target: "invalid" },
+    ...restProps
+  }: ButtonProps = $props();
+</script>
+
+{#if href}
+  <!-- HACK: Make the button act as a link using a form -->
+  <form action={href} class="contents">
+    <button
+      type="submit"
+      class="btn m-0 select-none px-2 py-2 {color
+        ? `variant-filled-${color}`
+        : ''} {width} {activate ? 'btn-hover' : ''} {activate_href && is_at_path(href)
+        ? 'btn-hover'
+        : ''}"
+      draggable="false"
+      {...restProps}>{@render children()}</button
+    >
+  </form>
+{:else}
+  <button
+    type={submit ? "submit" : "button"}
+    class="btn select-none px-2 py-2 {color ? `variant-filled-${color}` : ''} {width} {activate
+      ? 'btn-hover'
+      : ''}"
+    draggable="false"
+    use:popup={trigger_popup}
+    {...restProps}>{@render children()}</button
+  >
+{/if}