Show tags on file info page

[raluaces]

Summary

• Adds a Tags section to PreviewFileInfo (Views/Preview/Info.swift), displayed between the GPS/map section and the Albums section
• Renders each tag as a horizontal-scrolling capsule pill, identical in style to the existing Albums chips (background(.tint.opacity(0.12), in: Capsule()))
• No async fetch required — tags are already decoded as [String] on DFFile, unlike albums which are [Int] IDs that need a separate API call
• Section is hidden when file.tags is empty, matching albums behaviour

Test plan

• Open a file that has one or more tags — Tags section appears above Albums with capsule pills
• Open a file with no tags — Tags section is absent
• Tags with long names truncate to one line and the row scrolls horizontally
• Tint colour applies correctly in both light and dark mode