feat(auth): accept DID and AT-URI formats in login input (#178)
* feat(auth): accept DID and AT-URI formats in login input
Login field now normalizes additional AT Protocol identifier formats:
- at://handle and at://did:... (strips at:// prefix)
- did:plc:... and did:web:... (passed through without lowercasing)
- AT-URIs with path segments (extracts authority only)
- bsky.app profile URLs with DIDs
DIDs are kept case-sensitive since the DID spec requires it.
Updates label and helper text to reflect broader input support.
* style(auth): fix prettier formatting in login tests
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