Subscriber Management, Reaction Toggles, & File Uploads

We fixed various bugs in this update:

• Clicking a reaction emoji no longer briefly shows your reaction and then immediately removes it

• Project owners can now remove individual subscribers directly from the Subscribers page.

  A search bar lets you filter by email to quickly find and remove specific addresses.

• Uploaded files (logos and hero images) are now stored in isolated, user-specific folders using cryptographically random filenames.