feat(topbar): cross-version classname support

[ohitstom]

tested on:

• 1.2.46
• 1.2.45
• 1.2.14
• 1.2.15
• 1.2.16
• 1.2.17
• 1.2.22

note: im aware this approach is silly but to save rewriting the whole thing (or backporting more of v3) this approach works well and only took me 15 minutes lolol

[ohitstom]

waiting for review!