fix: add file extension to uploaded images (+ correct storage ref/URL)

[Copilot]

Problem

Uploaded sponsor/speaker/media images landed in Firebase Storage with no file extension: uploadImage named objects with a bare uuid. On top of that, the upload was broken — imageFolder arrives as a full public URL (https://storage.googleapis.com/BUCKET/events/x/) and was passed straight to ref(storage, url), which Firebase only understands for gs:// / firebasestorage URLs, producing a garbled ref.

Changes

src/utils/images/uploadImage.ts

• Add file extension derived from the blob MIME type (image/jpeg → jpg, image/svg+xml → svg, etc.), with a sane fallback. Filename is now ${uuid}.${ext}.
• Set the upload contentType from the blob.
• Reduce imageFolder (a full public URL) to a bucket-relative path before building the ref.
• Return the public URL from outputRef.fullPath, matching the server-side uploadBufferToStorage format.

src/services/firebase.ts

• Extract reusable storageUrlToPath() / pathToStorageUrl() helpers built on the existing baseStorageUrl / alternativeStorageUrl constants, instead of re-deriving the URL formats inline.

Notes

• Only new uploads get extensions; existing stored objects are unchanged.
• Server-side uploads (uploadBufferToStorage via checkFileTypes) and the PDF export already produce correct extensions.

🤖 Generated with Claude Code

[github-actions]

Visit the preview URL for this PR (updated for commit 964fa55):

• https://conferencecenterr--pr263-copilot-add-file-ext-6bvs2qww.web.app
• https://apiopenplanner--pr263-copilot-add-file-ext-xn1weg66.web.app
• https://serviceapi--pr263-copilot-add-file-ext-4cak1pp2.web.app

_{(expires Sun, 21 Jun 2026 20:10:42 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 0c15c45ea5a4c54095387eacf30c3755c9260f22}

[Copilot]

Pull request overview

This PR fixes Firebase Storage upload path/URL handling for client-side image uploads by ensuring uploaded objects have proper file extensions and content types, and by converting public storage URLs to bucket-relative paths before creating refs. It also aligns returned URLs with the server’s uploadBufferToStorage format and simplifies the PDF export route to return the actual uploaded public URL.

Changes:

• Add MIME-derived file extensions and contentType metadata for uploaded images; sanitize imageFolder from a public URL to a storage path before building ref().
• Introduce storageUrlToPath() / pathToStorageUrl() helpers in the Firebase service to centralize URL↔path conversion.
• Update the schedule PDF export route to return the uploaded PDF’s public URL directly.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/utils/images/uploadImage.ts	Adds extension/contentType, fixes ref creation by converting public URL folder to bucket path, returns canonical public URL from fullPath.
src/services/firebase.ts	Adds shared helpers to convert between public storage URLs and bucket-relative paths.
functions/src/api/routes/event/exportSchedulePdf.ts	Simplifies response to return the actual uploaded PDF public URL (from uploadBufferToStorage).

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