feat(desktop): expand prompt composer inline

[JUk1-GH]

Summary

• Add inline expand/collapse controls for the desktop prompt composer once prompt text grows beyond a few lines.
• Smoothly expand the left panel width by moving the draggable divider to the right, giving the composer more horizontal space.
• Animate the prompt textarea upward from the bottom in expanded mode, and smoothly restore the original layout on collapse.
• Add localized labels for the expand/collapse affordance.

Validation

• pnpm lint -- apps/desktop/src/renderer/src/App.tsx apps/desktop/src/renderer/src/components/chat/PromptInput.tsx apps/desktop/src/renderer/src/store.ts packages/i18n/src/locales/en.json packages/i18n/src/locales/zh-CN.json packages/i18n/src/locales/pt-BR.json
• pnpm --filter @open-codesign/desktop typecheck
• pnpm --filter @open-codesign/i18n test
• pnpm --filter @open-codesign/desktop test
• pre-commit turbo run test
• pre-push typecheck + lint

[JUk1-GH]

原来的输入框太小了，没有自适应变化和展开功能，现在我加了点击外扩角标后，左右面板的可拖拽分割线平滑右移，左侧输入区获得更多宽度，同时输入框从底部向上扩展；点击收起再平滑回到原布局。

[github-actions]

Findings

• [Major] Escape handling leaks to global shortcuts while composer is expanded — pressing Escape in expanded composer also bubbles to app-level escape bindings (close dialog/view mode changes), causing unintended UI state changes beyond collapse. Evidence: apps/desktop/src/renderer/src/components/chat/PromptInput.tsx:180, apps/desktop/src/renderer/src/App.tsx:164
  Suggested fix:

  const handleDocKeyDown = (e: globalThis.KeyboardEvent) => {
    if (e.key !== 'Escape') return;
    e.preventDefault();
    e.stopPropagation();
    setIsExpanded(false);
  };

• [Minor] Forced synchronous layout on every textarea change risks typing jank — resizeTextarea performs offsetHeight reflow and is called from onChange, which can degrade input responsiveness as prompt length grows. Evidence: apps/desktop/src/renderer/src/components/chat/PromptInput.tsx:79, apps/desktop/src/renderer/src/components/chat/PromptInput.tsx:229
  Suggested fix:

  function resizeTextarea(el: HTMLTextAreaElement, isExpanded: boolean): boolean {
    const rowHeight = getTextareaLineHeight(el);
    el.style.height = 'auto';
    const trueScrollHeight = el.scrollHeight;
    const nextHeight = isExpanded
      ? Math.min(Math.max(trueScrollHeight, window.innerHeight * 0.4), window.innerHeight * 0.6)
      : Math.min(trueScrollHeight, rowHeight * MAX_TEXTAREA_ROWS);
    el.style.height = `${nextHeight}px`;
    return trueScrollHeight > rowHeight * 2.5;
  }

Summary

• Review mode: initial
• Two issues found in the latest diff: one behavioral regression in Escape handling and one input-path performance risk.
• Required context docs docs/VISION.md and docs/PRINCIPLES.md were not found in this checkout (Not found in repo/docs).
• Test coverage for the new expand/collapse keyboard interaction and textarea resizing path is missing in this diff.

Testing

• Not run (automation)

open-codesign Bot

[github-actions]

Escape here collapses the prompt but still bubbles to window-level escape bindings in App, which can also close dialogs/switch modes. Please consume the event (preventDefault + stopPropagation) when expanded composer handles Escape.

[github-actions]

void el.offsetHeight forces sync layout, and this function is called from onChange on each keystroke. This can cause typing jank for long prompts; prefer a non-forced measurement/update path.

[hqhq1025]

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