diff --git a/ui-electrobun/src/mainview/ui/CustomDropdown.svelte b/ui-electrobun/src/mainview/ui/CustomDropdown.svelte
index 94059bc..28808ac 100644
--- a/ui-electrobun/src/mainview/ui/CustomDropdown.svelte
+++ b/ui-electrobun/src/mainview/ui/CustomDropdown.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { ChevronDown } from 'lucide-svelte';
+  import { ChevronDown } from "lucide-svelte";
 
   interface DropdownItem {
     value: string;
@@ -16,7 +16,14 @@
     disabled?: boolean;
   }
 
-  let { items, selected, placeholder = 'Select...', onSelect, groupBy = false, disabled = false }: Props = $props();
+  let {
+    items,
+    selected,
+    placeholder = "Select...",
+    onSelect,
+    groupBy = false,
+    disabled = false,
+  }: Props = $props();
 
   let open = $state(false);
   let focusIndex = $state(-1);
@@ -24,10 +31,12 @@
   let menuRef = $state<HTMLDivElement | null>(null);
   let triggerRef = $state<HTMLButtonElement | null>(null);
 
-  let selectedLabel = $derived(items.find(i => i.value === selected)?.label ?? placeholder);
+  let selectedLabel = $derived(
+    items.find((i) => i.value === selected)?.label ?? placeholder,
+  );
 
   // Group items by group field
-  let groups = $derived<string[]>(() => {
+  let groups = $derived.by<string[]>(() => {
     if (!groupBy) return [];
     const seen = new Set<string>();
     for (const item of items) {
@@ -49,7 +58,7 @@
     if (disabled) return;
     open = !open;
     if (open) {
-      focusIndex = flatItems.findIndex(i => i.value === selected);
+      focusIndex = flatItems.findIndex((i) => i.value === selected);
       computeFlip();
     }
   }
@@ -67,7 +76,7 @@
 
   function handleKeydown(e: KeyboardEvent) {
     if (!open) {
-      if (e.key === 'ArrowDown' || e.key === 'Enter' || e.key === ' ') {
+      if (e.key === "ArrowDown" || e.key === "Enter" || e.key === " ") {
         e.preventDefault();
         toggle();
       }
@@ -75,22 +84,22 @@
     }
 
     switch (e.key) {
-      case 'ArrowDown':
+      case "ArrowDown":
         e.preventDefault();
         focusIndex = Math.min(focusIndex + 1, flatItems.length - 1);
         break;
-      case 'ArrowUp':
+      case "ArrowUp":
         e.preventDefault();
         focusIndex = Math.max(focusIndex - 1, 0);
         break;
-      case 'Enter':
-      case ' ':
+      case "Enter":
+      case " ":
         e.preventDefault();
         if (focusIndex >= 0 && focusIndex < flatItems.length) {
           select(flatItems[focusIndex].value);
         }
         break;
-      case 'Escape':
+      case "Escape":
         e.preventDefault();
         close();
         triggerRef?.focus();
@@ -120,13 +129,24 @@
   </button>
 
   <!-- svelte-ignore a11y_no_static_element_interactions a11y-no-static-element-interactions -->
-  <div class="dd-backdrop" style:display={open ? 'block' : 'none'} onclick={handleBackdropClick} onkeydown={e => e.key === 'Escape' && close()}></div>
+  <div
+    class="dd-backdrop"
+    style:display={open ? "block" : "none"}
+    onclick={handleBackdropClick}
+    onkeydown={(e) => e.key === "Escape" && close()}
+  ></div>
 
-  <div class="dd-menu" class:flip-up={flipUp} style:display={open ? 'flex' : 'none'} bind:this={menuRef} role="listbox">
-    {#if groupBy && groups().length > 0}
-      {#each groups() as group}
+  <div
+    class="dd-menu"
+    class:flip-up={flipUp}
+    style:display={open ? "flex" : "none"}
+    bind:this={menuRef}
+    role="listbox"
+  >
+    {#if groupBy && groups.length > 0}
+      {#each groups as group}
         <div class="dd-group-header">{group}</div>
-        {#each flatItems.filter(i => i.group === group) as item, idx}
+        {#each flatItems.filter((i) => i.group === group) as item, idx}
           {@const globalIdx = flatItems.indexOf(item)}
           <button
             class="dd-option"
@@ -134,12 +154,12 @@
             class:focused={globalIdx === focusIndex}
             role="option"
             aria-selected={item.value === selected}
-            onclick={() => select(item.value)}
-          >{item.label}</button>
+            onclick={() => select(item.value)}>{item.label}</button
+          >
         {/each}
       {/each}
       <!-- Ungrouped items -->
-      {#each flatItems.filter(i => !i.group) as item}
+      {#each flatItems.filter((i) => !i.group) as item}
         {@const globalIdx = flatItems.indexOf(item)}
         <button
           class="dd-option"
@@ -147,8 +167,8 @@
           class:focused={globalIdx === focusIndex}
           role="option"
           aria-selected={item.value === selected}
-          onclick={() => select(item.value)}
-        >{item.label}</button>
+          onclick={() => select(item.value)}>{item.label}</button
+        >
       {/each}
     {:else}
       {#each flatItems as item, idx}
@@ -158,48 +178,89 @@
           class:focused={idx === focusIndex}
           role="option"
           aria-selected={item.value === selected}
-          onclick={() => select(item.value)}
-        >{item.label}</button>
+          onclick={() => select(item.value)}>{item.label}</button
+        >
       {/each}
     {/if}
   </div>
 </div>
 
 <style>
-  .dd-root { position: relative; width: 100%; }
+  .dd-root {
+    position: relative;
+    width: 100%;
+  }
 
   .dd-trigger {
-    width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 0.375rem;
+    width: 100%;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 0.375rem;
     padding: 0.375rem 0.5rem;
-    background: var(--ctp-surface0); border: 1px solid var(--ctp-surface1); border-radius: 0.25rem;
-    color: var(--ctp-text); font-size: 0.8125rem; font-family: var(--ui-font-family);
-    cursor: pointer; text-align: left;
+    background: var(--ctp-surface0);
+    border: 1px solid var(--ctp-surface1);
+    border-radius: 0.25rem;
+    color: var(--ctp-text);
+    font-size: 0.8125rem;
+    font-family: var(--ui-font-family);
+    cursor: pointer;
+    text-align: left;
     transition: border-color 0.12s;
   }
-  .dd-trigger:hover:not(.disabled) { border-color: var(--ctp-surface2); }
-  .dd-trigger:focus-visible { outline: 2px solid var(--ctp-blue); outline-offset: -1px; }
-  .dd-trigger.open { border-color: var(--ctp-blue); }
-  .dd-trigger.disabled { opacity: 0.4; cursor: not-allowed; }
+  .dd-trigger:hover:not(.disabled) {
+    border-color: var(--ctp-surface2);
+  }
+  .dd-trigger:focus-visible {
+    outline: 2px solid var(--ctp-blue);
+    outline-offset: -1px;
+  }
+  .dd-trigger.open {
+    border-color: var(--ctp-blue);
+  }
+  .dd-trigger.disabled {
+    opacity: 0.4;
+    cursor: not-allowed;
+  }
 
-  .dd-trigger-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  .dd-trigger-label {
+    flex: 1;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
 
   .dd-trigger :global(.dd-chev) {
-    color: var(--ctp-overlay1); flex-shrink: 0;
+    color: var(--ctp-overlay1);
+    flex-shrink: 0;
     transition: transform 0.15s;
   }
-  .dd-trigger :global(.dd-chev-open) { transform: rotate(180deg); }
+  .dd-trigger :global(.dd-chev-open) {
+    transform: rotate(180deg);
+  }
 
   .dd-backdrop {
-    position: fixed; inset: 0; z-index: 49; background: transparent;
+    position: fixed;
+    inset: 0;
+    z-index: 49;
+    background: transparent;
   }
 
   .dd-menu {
-    position: absolute; top: calc(100% + 0.25rem); left: 0; right: 0; z-index: 50;
+    position: absolute;
+    top: calc(100% + 0.25rem);
+    left: 0;
+    right: 0;
+    z-index: 50;
     flex-direction: column;
-    background: var(--ctp-mantle); border: 1px solid var(--ctp-surface1); border-radius: 0.25rem;
+    background: var(--ctp-mantle);
+    border: 1px solid var(--ctp-surface1);
+    border-radius: 0.25rem;
     padding: 0.25rem;
-    max-height: 14rem; overflow-y: auto;
-    box-shadow: 0 0.5rem 1rem color-mix(in srgb, var(--ctp-crust) 60%, transparent);
+    max-height: 14rem;
+    overflow-y: auto;
+    box-shadow: 0 0.5rem 1rem
+      color-mix(in srgb, var(--ctp-crust) 60%, transparent);
   }
   .dd-menu.flip-up {
     top: auto;
@@ -208,22 +269,43 @@
   }
 
   .dd-group-header {
-    padding: 0.25rem 0.5rem 0.125rem; font-size: 0.625rem; font-weight: 700;
-    text-transform: uppercase; letter-spacing: 0.06em; color: var(--ctp-overlay0);
+    padding: 0.25rem 0.5rem 0.125rem;
+    font-size: 0.625rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.06em;
+    color: var(--ctp-overlay0);
     border-top: 1px solid var(--ctp-surface0);
   }
-  .dd-group-header:first-child { border-top: none; }
+  .dd-group-header:first-child {
+    border-top: none;
+  }
 
   .dd-option {
-    width: 100%; padding: 0.3rem 0.5rem; background: none; border: none;
-    border-radius: 0.2rem; color: var(--ctp-subtext1); font-size: 0.8125rem;
-    font-family: var(--ui-font-family); cursor: pointer; text-align: left;
+    width: 100%;
+    padding: 0.3rem 0.5rem;
+    background: none;
+    border: none;
+    border-radius: 0.2rem;
+    color: var(--ctp-subtext1);
+    font-size: 0.8125rem;
+    font-family: var(--ui-font-family);
+    cursor: pointer;
+    text-align: left;
     transition: background 0.08s;
   }
-  .dd-option:hover, .dd-option.focused { background: var(--ctp-surface0); color: var(--ctp-text); }
-  .dd-option:focus-visible { outline: 2px solid var(--ctp-blue); outline-offset: -1px; }
+  .dd-option:hover,
+  .dd-option.focused {
+    background: var(--ctp-surface0);
+    color: var(--ctp-text);
+  }
+  .dd-option:focus-visible {
+    outline: 2px solid var(--ctp-blue);
+    outline-offset: -1px;
+  }
   .dd-option.selected {
     background: color-mix(in srgb, var(--ctp-blue) 15%, transparent);
-    color: var(--ctp-blue); font-weight: 500;
+    color: var(--ctp-blue);
+    font-weight: 500;
   }
 </style>