feat(web): connect quick share flow

Signed-off-by: JustMe <mr.toing@outlook.com>

web/src/lib/clipboard.ts

@@ -0,0 +1,26 @@
+export interface ClipboardPayload {
+  files: File[];
+  text: string;
+}
+
+/** 读取剪贴板(需要用户手势与权限)。失败或被拒绝返回 null */
+export async function readClipboard(): Promise<ClipboardPayload | null> {
+  try {
+    if (!navigator.clipboard.read) return { files: [], text: await navigator.clipboard.readText() };
+    const files: File[] = [];
+    let text = '';
+    for (const entry of await navigator.clipboard.read()) {
+      for (const type of entry.types) {
+        const blob = await entry.getType(type);
+        if (type.startsWith('image/')) {
+          files.push(new File([blob], `粘贴-${Date.now()}.${type.split('/')[1] ?? 'png'}`, { type }));
+        } else if (type === 'text/plain' && !text) {
+          text = await blob.text();
+        }
+      }
+    }
+    return { files, text };
+  } catch {
+    return null;
+  }
+}