Add housing for legacy song select footer components

[frenzibyte]

• Depends on Implement legacy back button UI #37676
• Depends on Implement legacy footer buttons UI #37855
• Depends on Implement legacy footer user banner #37876

This completes the footer UI-wise. The buttons will be hooked into activating the existing overlays at a later stage, but confirming that the legacy UI can be implemented is the primary step achieved here.

Notes:

• The logo is intentionally positioned differently from stable, particularly positioned similar to lazer. This is done so as to not have the logo shift positions when switching between a lazer skin and a legacy skin. Whether this will stay or match stable is up for discussion, but my hope is that skin makers can easily output a "lazer" version of their skins (this could be mandatory in other areas of song select that I have not come across yet).

Preview (16:9, 4:3, custom skin):

CleanShot.2026-06-02.at.10.15.18.mp4

CleanShot.2026-06-02.at.10.19.05.mp4

CleanShot.2026-06-02.at.10.42.27.mp4

[unststable]

I assume you'll still have to adjust the logo's position to match the one in the stable release, since there are skins that intentionally cover it up? (i don't know your take on this, so I thought it best to mention it.)

2026-06-02.19-04-41.mp4

2026-06-02.19-05-02.mp4

[frenzibyte]

As I pointed out in OP this is up for debate. I have noticed myself some skins design specifically around the rubble effect of the stable logo, I think it is better that those skins are remade with lazer in mind (and therefore account for lazer logo positioning), but that is just an initial thought for now, nothing is final yet.

[EVAST9919]

A long time ago I made some super-gimmicky templates for footer buttons (some of them also react to the selected gamemode). May be something worth looking into in the future. However I'm not sure how widespread these techniques are and if they are worth implementing at all.
tricky skins.zip

222.mp4

[unststable]

As I pointed out in OP this is up for debate. I have noticed myself some skins design specifically around the rubble effect of the stable logo, I think it is better that those skins are remade with lazer in mind (and therefore account for lazer logo positioning), but that is just an initial thought for now, nothing is final yet.

My take that changing the logo position for legacy skins is worth it. It’s unlikely that most skin creators would be happy to rework the bottom panel just to release a “lazer” version (it can not happen for skins that is old, for example), and besides, changing logo position seems like a pretty little change (doesn't it?)
Waiting for your thoughts

[peppy]

I agree with the logo position changing.

[frenzibyte]

Fair enough, I'll change it to match stable.