UX+Refactoring: use side-drawer for menu, reorder menu structure

src/UI/Base/Page.svelte

@@ -0,0 +1,38 @@
+<script lang="ts">
+  // A fake 'page' which can be shown; kind of a modal
+  import { UIEventSource } from "../../Logic/UIEventSource"
+  import { Modal } from "flowbite-svelte"
+
+  export let shown: UIEventSource<boolean>
+  let _shown = false
+  export let onlyLink: boolean = false
+  shown.addCallbackAndRun(sh => {
+    _shown = sh
+  })
+  export let fullscreen: boolean = false
+
+  const shared = "defaultClass normal-background dark:bg-gray-800 rounded-lg border-gray-200 dark:border-gray-700 border-gray-200 dark:border-gray-700 divide-gray-200 dark:divide-gray-700 shadow-md"
+  let defaultClass = "relative flex flex-col mx-auto w-full divide-y " + shared
+  if (fullscreen) {
+    defaultClass = shared
+  }
+  let dialogClass = "fixed top-0 start-0 end-0 h-modal inset-0 z-50 w-full p-4 flex";
+  if(fullscreen){
+    dialogClass += " h-full-child"
+  }
+  let bodyClass = "h-full p-4 md:p-5 space-y-4 flex-1 overflow-y-auto overscroll-contain"
+</script>
+
+{#if !onlyLink}
+  <Modal open={_shown} on:close={() => shown.set(false)} size="xl" {defaultClass} {bodyClass} {dialogClass} color="none">
+    <slot name="header" slot="header" />
+    <slot />
+    {#if $$slots.footer}
+      <slot name="footer" />
+    {/if}
+  </Modal>
+{:else}
+  <button class="as-link" on:click={() => shown.setData(true)}>
+    <slot name="header" />
+  </button>
+{/if}