Fix LookML ${view.field} reference resolution and cycle handling

The reference resolver regex (${name}) never matched dotted refs, so:
- self-view-qualified refs (${this_view.field}) leaked the literal ${...}
  into generated SQL (a hard syntax error); for measures it also broke the
  metric. Real models (e.g. the GA360 block) use this form pervasively.
- cross-view refs (${other_view.field}) likewise leaked literally.
- chains deeper than 10 silently truncated; self-references expanded 10x.

Normalize self-view qualifiers to bare refs before resolution, make both
resolvers dotted-ref aware (cross-view -> qualified column + warning, since
sidemantic cannot represent an inline cross-model column), and replace the
fixed depth cap with cycle detection so acyclic chains of any depth resolve
and circular refs terminate.

Note: cross-view field references remain a modeling gap (sidemantic has no
inline cross-model column); the adapter now emits a qualified column and
warns instead of producing invalid ${...} SQL.

Author: nicosuave