Add typeahead prompt selector with fuzzy search on titles

This replaces the prompt dropdown button with a fuzzy search input to filter prompts. Uses [svelte-typeahead](https://metonym.github.io/svelte-typeahead/).

src/app.scss

@@ -264,6 +264,38 @@ $modal-background-background-color-dark: rgba($dark, 0.86) !default; // remove t
   }
 }
 
+[data-svelte-typeahead] {
+  display: flex;
+
+  ul.svelte-typeahead-list {
+    max-height: calc(60vh);
+    overflow: auto;
+
+    > li:not(:last-of-type) {
+      padding: 0;
+      border-bottom: 0 none;
+    }
+  }
+  
+  &[aria-expanded="true"] {
+    z-index: 3;
+  }
+
+  [data-svelte-search] {
+    flex: 1;
+  
+    input {
+      @extend .button;
+      @extend .default-text;
+      text-align: center;
+  
+      &::placeholder {
+        @extend .default-text;
+      }
+    }
+  }
+}
+
 /* Bulma layout hacks */
 
 .chat-option-menu.navbar-item {

src/lib/Prompts.svelte

@@ -1,39 +1,37 @@
 <script lang="ts">
+  import Typeahead from 'svelte-typeahead'
   import prompts from '../awesome-chatgpt-prompts/prompts.csv'
 
   const inputPrompt = (prompt: string) => {
     input.value = prompt
     input.style.height = 'auto'
     input.style.height = input.scrollHeight + 'px'
-    active = false
   }
 
-  export let input : HTMLTextAreaElement
+  const extract = (prompt: typeof prompts[0]) => prompt.act
 
-  let active: boolean = false
+  export let input : HTMLTextAreaElement
 </script>
 
 {#if input}
 <div class="columns is-centered">
   <div class="column is-half">
-    <div class="dropdown is-fullwidth" class:is-active={active}>
-      <!-- svelte-ignore a11y-click-events-have-key-events -->
-      <div class="dropdown-trigger" on:click={() => { active = !active }}>
-        <button class="button is-fullwidth" aria-haspopup="true" aria-controls="dropdown-menu">
-          <span>Select a pre-made prompt</span>
-          <span class="icon is-small">👇</span>
-        </button>
-      </div>
-      <div class="dropdown-menu" id="dropdown-menu" role="menu">
-        <div class="dropdown-content">
-          {#each prompts as prompt}
-            <a title={prompt.prompt} class="dropdown-item" href={'#'} on:click|preventDefault={() => inputPrompt(prompt.prompt)}>
-              {prompt.act}
-            </a>
-          {/each}
-        </div>
-      </div>
-    </div>
+    <Typeahead
+      data={prompts}
+      {extract}
+      label="Select a pre-made prompt"
+      hideLabel
+      showDropdownOnFocus
+      showAllResultsOnFocus
+      inputAfterSelect="clear"
+      on:select={({ detail }) => inputPrompt(detail.original.prompt)}
+      placeholder="Select a pre-made prompt 👇"
+      let:result
+    >
+      <a class="dropdown-item" href="#top" on:click|preventDefault title="{result.original.prompt}">
+        {@html result.string}
+      </a>
+    </Typeahead>
   </div>
 </div>