feat(desktop): double-Enter sends the queued turn, and the row says Enter

Empty Enter while busy was a hard no-op, so a queued turn could only be
sent early via the panel's send arrow or Cmd+Shift+K. With prompts
queued, a second Enter now promotes the head and interrupts, mirroring
the idle empty-Enter drain. Nothing queued keeps the old no-op.

The panel's send-now row action switches from a bare up-arrow to the
return glyph, so the row states the keybind the double-send uses.

apps/desktop/src/app/chat/composer/index.tsx

@@ -724,12 +724,21 @@ export function ChatBar({
         return
       }
 
-      // Empty Enter while busy is a no-op — interrupting is explicit (Stop/Esc),
-      // never a stray Enter after sending. With a payload, submitDraft queues it.
-      // Gate on the live DOM payload (not the render-lagged composer state) so a
-      // message typed fast / via IME while busy still reaches submitDraft() and
-      // gets queued instead of being mistaken for an empty Enter.
+      // Empty Enter while busy. With prompts queued this is the double-send:
+      // the first Enter put the words in the queue, a second sends them now
+      // (promote + interrupt + drain on settle), mirroring the idle empty-Enter
+      // drain above. With nothing queued it stays a no-op — interrupting is
+      // explicit (Stop/Esc), never a stray Enter after sending. Gate on the live
+      // DOM payload (not the render-lagged composer state) so a message typed
+      // fast / via IME while busy still reaches submitDraft() and gets queued
+      // instead of being mistaken for an empty Enter.
       if (busy && !hasLivePayload) {
+        const head = queuedPrompts.find(entry => entry.id !== queueEdit?.entryId)
+
+        if (head) {
+          sendQueuedNow(head.id)
+        }
+
         return
       }
 

apps/desktop/src/app/chat/composer/queue-panel.tsx

@@ -4,7 +4,7 @@ import { Button } from '@/components/ui/button'
 import { Codicon } from '@/components/ui/codicon'
 import { Tip } from '@/components/ui/tooltip'
 import { type Translations, useI18n } from '@/i18n'
-import { ArrowUp, iconSize, Pencil, Trash2 } from '@/lib/icons'
+import { CornerDownLeft, iconSize, Pencil, Trash2 } from '@/lib/icons'
 import { cn } from '@/lib/utils'
 import type { QueuedPromptEntry } from '@/store/composer-queue'
 
@@ -103,7 +103,7 @@ export function QueuePanel({
                     type="button"
                     variant="ghost"
                   >
-                    <ArrowUp className={iconSize.xs} />
+                    <CornerDownLeft className={iconSize.xs} />
                   </Button>
                 </Tip>
                 <Tip label={c.queueDelete}>

apps/desktop/src/lib/icons.ts

@@ -33,6 +33,7 @@ import {
   IconCommand as Command,
   IconCopy as Copy,
   IconCopy as CopyIcon,
+  IconCornerDownLeft as CornerDownLeft,
   IconCpu as Cpu,
   IconCreditCard as CreditCard,
   IconDownload as Download,
@@ -155,6 +156,7 @@ export {
   Command,
   Copy,
   CopyIcon,
+  CornerDownLeft,
   Cpu,
   CreditCard,
   Download,