feat: replace puzzle icon with extensions-blocks icon for manager button (#8644)

## Summary

Replace the manager button puzzle icon with a custom extensions-blocks
SVG icon and add a "Manage Extensions" text label to the top bar button.

## Changes

- **What**: Swap `icon-[lucide--puzzle]` →
`icon-[comfy--extensions-blocks]` in TopMenuSection, ComfyMenuButton,
and ManagerDialog. Add visible "Manage Extensions" label (hidden below
md). Align tooltip with new label text.

## Review Focus

- Visual appearance of the new icon at different sizes
- Button layout with text label at md+ breakpoints
- Red dot notification positioning with wider button

Fixes COM-12161

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8644-feat-replace-puzzle-icon-with-extensions-blocks-icon-for-manager-button-2fe6d73d3650815c8867efc5a0842ef7)
by [Unito](https://www.unito.io)

Co-authored-by: Alexander Brown <drjkl@comfy.org>

packages/design-system/src/icons/extensions-blocks.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 16 16"><path d="M6.66667 14V5.33333C6.66667 5.15652 6.59643 4.98695 6.4714 4.86193C6.34638 4.7369 6.17681 4.66667 6 4.66667H2.66667C2.48986 4.66667 2.32029 4.7369 2.19526 4.86193C2.07024 4.98695 2 5.15652 2 5.33333V13.3333C2 13.5101 2.07024 13.6797 2.19526 13.8047C2.32029 13.9298 2.48986 14 2.66667 14H10.6667C10.8435 14 11.013 13.9298 11.1381 13.8047C11.2631 13.6797 11.3333 13.5101 11.3333 13.3333V10C11.3333 9.82319 11.2631 9.65362 11.1381 9.5286C11.013 9.40357 10.8435 9.33333 10.6667 9.33333H2M10 2H13.3333C13.7015 2 14 2.29848 14 2.66667V6C14 6.36819 13.7015 6.66667 13.3333 6.66667H10C9.63181 6.66667 9.33333 6.36819 9.33333 6V2.66667C9.33333 2.29848 9.63181 2 10 2Z" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/></svg>

src/components/TopMenuSection.vue

@@ -19,12 +19,14 @@
             <Button
               v-tooltip.bottom="customNodesManagerTooltipConfig"
               variant="secondary"
-              size="icon"
-              :aria-label="t('menu.customNodesManager')"
+              :aria-label="t('menu.manageExtensions')"
               class="relative"
               @click="openCustomNodeManager"
             >
-              <i class="icon-[lucide--puzzle] size-4" />
+              <i class="icon-[comfy--extensions-blocks] size-4" />
+              <span class="not-md:hidden">
+                {{ t('menu.manageExtensions') }}
+              </span>
               <span
                 v-if="shouldShowRedDot"
                 class="absolute top-0.5 right-1 size-2 rounded-full bg-red-500"
@@ -220,7 +222,7 @@ const queueHistoryTooltipConfig = computed(() =>
   buildTooltipConfig(t('sideToolbar.queueProgressOverlay.viewJobHistory'))
 )
 const customNodesManagerTooltipConfig = computed(() =>
-  buildTooltipConfig(t('menu.customNodesManager'))
+  buildTooltipConfig(t('menu.manageExtensions'))
 )
 const queueContextMenu = ref<InstanceType<typeof ContextMenu> | null>(null)
 const queueContextMenuItems = computed<MenuItem[]>(() => [

src/components/sidebar/ComfyMenuButton.vue

@@ -230,7 +230,7 @@ const extraMenuItems = computed(() => [
   {
     key: 'manage-extensions',
     label: t('menu.manageExtensions'),
-    icon: 'icon-[lucide--puzzle]',
+    icon: 'icon-[comfy--extensions-blocks]',
     command: showManageExtensions
   }
 ])

src/workbench/extensions/manager/components/manager/ManagerDialog.vue

@@ -6,7 +6,7 @@
     class="manager-dialog"
   >
     <template #leftPanelHeaderTitle>
-      <i class="icon-[lucide--puzzle]" />
+      <i class="icon-[comfy--extensions-blocks]" />
       <h2 class="text-neutral text-base">{{ $t('manager.title') }}</h2>
     </template>
     <template #leftPanel>