feat(web-storage): implement media upload with quota hints

apps/web/src/services/storage-quota.ts

@@ -0,0 +1,57 @@
+import { localDb } from "@/services/local-db";
+
+export const DEFAULT_CLOUD_QUOTA_BYTES = 100 * 1024 * 1024;
+
+type StorageQuotaSnapshot = {
+  usedBytes: number;
+  quotaBytes: number;
+  remainingBytes: number;
+  usedPercent: number;
+};
+
+function measureTextBytes(value: string | null): number {
+  if (!value) {
+    return 0;
+  }
+
+  return new Blob([value]).size;
+}
+
+export async function getStorageQuotaSnapshot(userId: string): Promise<StorageQuotaSnapshot> {
+  const tasks = await localDb.tasks.where("userId").equals(userId).toArray();
+
+  const usedBytes = tasks.reduce((total, task) => {
+    if (task.deletedAt !== null) {
+      return total;
+    }
+
+    return (
+      total +
+      measureTextBytes(task.title) +
+      measureTextBytes(task.contentText) +
+      measureTextBytes(task.contentJson)
+    );
+  }, 0);
+
+  const remainingBytes = Math.max(DEFAULT_CLOUD_QUOTA_BYTES - usedBytes, 0);
+  const usedPercent = Math.min((usedBytes / DEFAULT_CLOUD_QUOTA_BYTES) * 100, 100);
+
+  return {
+    usedBytes,
+    quotaBytes: DEFAULT_CLOUD_QUOTA_BYTES,
+    remainingBytes,
+    usedPercent
+  };
+}
+
+export function formatStorageSize(bytes: number): string {
+  if (bytes < 1024) {
+    return `${bytes} B`;
+  }
+
+  if (bytes < 1024 * 1024) {
+    return `${(bytes / 1024).toFixed(1)} KB`;
+  }
+
+  return `${(bytes / (1024 * 1024)).toFixed(2)} MB`;
+}