✨ Add version drop down to Artifact & Collection pages, simplify the version-uid handling

[falexwolf]

Example for tagged versions:

Before	After
no version dropdown

Example for non-tagged versions (show full 4-char version uid, a 4-digit base62 number):

uid is 4 chars	uid is number

To avoid confusion about the version uid, we're no longer prefixing with r and stripping leading 0s.

Before	After

Internal ref: https://github.com/laminlabs/laminhub/pull/1347