fix(quick-start): disable prompt autocomplete

frontend/src/pages/quick-start/index.test.tsx

@@ -498,6 +498,14 @@ describe('QuickStartPage', () => {
     )
   })
 
+  it('keeps browser form history out of the creation composer', () => {
+    renderAt('/quick-start', serviceFor(null))
+    const composer = screen.getByRole('textbox', { name: '创作指令' })
+
+    expect(composer.getAttribute('autocomplete')).toBe('off')
+    expect(composer.closest('form')?.getAttribute('autocomplete')).toBe('off')
+  })
+
   it('keeps the entry and run canvases at least viewport height', async () => {
     const entry = renderAt('/quick-start', serviceFor(null))
     expect(entry.getByLabelText('创作指令').closest('section')?.className).toContain(

frontend/src/pages/quick-start/index.tsx

@@ -804,6 +804,7 @@ function QuickStartInput({
         >
           <form
             onSubmit={(event) => void submit(event)}
+            autoComplete="off"
             data-prompt-state={promptState}
             className={`quick-start-agent-composer grid items-center gap-1.5 overflow-hidden rounded-xl border border-app-line-strong bg-app-surface-raised p-1.5 shadow-app-panel transition-shadow focus-within:border-app-accent focus-within:shadow-[var(--shadow-app-composer-focus)] ${
               hasConversation ? 'sm:grid-cols-[1fr_auto]' : 'sm:grid-cols-[1fr_auto_auto]'
@@ -814,6 +815,7 @@ function QuickStartInput({
               <input
                 id="quick-start-prompt"
                 type="text"
+                autoComplete="off"
                 aria-label="创作指令"
                 value={prompt}
                 onChange={(event) => setPrompt(event.target.value)}