fix: correct Firebase Storage ref and public URL construction in uploadImage

[Copilot]

uploadImage received imageFolder as a full public URL (e.g. https://storage.googleapis.com/bucket/events/evt-1/) from filesPath.imageFolder, then passed it directly to Firebase's ref(storage, url). Firebase only recognises gs:// and firebasestorage.googleapis.com URLs — everything else is treated as a raw path string, causing the ref to point to a garbled location and the returned URL to be wrong.

Changes

• src/utils/images/uploadImage.ts
  • Strip the bucket URL prefix from imageFolder before creating the ref(), handling both storage.googleapis.com/BUCKET/ and BUCKET.storage.googleapis.com/ formats
  • Return the public URL constructed from outputRef.fullPath, matching the https://BUCKET.storage.googleapis.com/PATH format used by the server-side uploadBufferToStorage

// Before
const outputRef = ref(storage, `${imageFolder}${fileName}`)  // imageFolder is a full URL → garbled ref
return `${imageFolder}${fileName}`

// After
const folderPath = imageFolder.startsWith(baseUrl) ? imageFolder.slice(baseUrl.length) : /* ... */ imageFolder
const outputRef = ref(storage, `${folderPath}${fileName}`)
return `https://${storageBucket}.storage.googleapis.com/${outputRef.fullPath}`