[Feature] Group albums by name prefix

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature The albums page already has Group by year and Group by owner. On a personal instance those don't help much. Year just mixes unrelated albums together. Owner is a single group if you're the only user. The list stays long and unfocused. I keep a lot of albums for different kinds of media, and I already name them with a category prefix: • game-cod, game-deltaforce, game-tarkov • travel-japan, travel-iceland • aigc, aigc-videos What I actually want is those sitting under game, travel, aigc. That's more useful than year/owner for anyone who maintains many small album types (game clips, trips, AI-generated stuff, etc.). This is not nested albums, album folders, or album tags. Those are covered in #15285, #5078, #19823, #28613 and they need a new data model. I'm asking for a view-only grouping option on the exi…