Add Immich map link to location detail page

[nomad-debugger]

Summary

• Adds a 📷 Immich button to the external maps section on location detail pages, alongside the existing Apple, Google, and OSM buttons
• The button links directly to Immich's map view at the location's coordinates (/map#16.64/{lat}/{lon})
• The button only appears when the user has an Immich integration configured in Settings
• The Immich server URL is exposed via the existing user metadata endpoint (/auth/user-metadata/), so no additional API call is needed on the location page

Closes #1117

Test plan

• Configure an Immich integration in Settings → Integrations
• Navigate to a location detail page that has coordinates set
• Verify the 📷 Immich button appears in the maps section alongside Apple, Google, and OSM
• Click the button and confirm it opens Immich's map view centred on the location
• Verify no Immich button appears for users without an Immich integration configured

🤖 Generated with Claude Code

[vercel]

@nomad-debugger is attempting to deploy a commit to the Sean Morley's Projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

🤖 AdventureLog Bot

🚫 This PR was automatically closed.

Pull requests may only be opened for issues labeled ready.

[nomad-debugger]

Hi @seanmorley15, I realize this pull request is closed because my issue only got moved to the backlog but could it perhaps be of interest to you nevertheless?

[seanmorley15]

I will take a look at it, just moved to ready.
Just a little concerned with how it’s getting the immich url in the backend but I will add feedback when I have time to review.
It’s a good idea!