[Feature] Deep links to specific photos in Partner Sharing with timeline navigation

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature Description Allow users to share a direct URL to a specific photo within a partner-shared library while preserving the ability to navigate to previous and next photos in the partner's timeline. Current behavior Immich Partner Sharing uses URLs in the following format: However, opening this URL directly from another user's session does not reliably open the intended photo with the expected timeline navigation. Creating a public shared link for a single photo is not a suitable workaround because the recipient cannot navigate to adjacent photos in the original partner-shared library. Expected behavior • Allow direct links to specific photos in a partner-shared library. • Open the selected photo when the recipient clicks the URL. • Preserve the partner's timeline context, including pr…