Web UI: zone naming and reverse zones, ACL suggestions, record form

- New zone dialog: choose Domain or Reverse zone. Reverse zones are
  created from a network and their name is generated; both kinds show the
  exact zone name and flag likely mistakes (addresses or URLs as names,
  host-like names, duplicates in the view, parent/child zones, networks
  off the octet/nibble boundaries) before anything is submitted.
- Record form: clears every field but the type after an add; shows the
  record exactly as it will be stored and warns about unqualified names.
  In reverse zones it takes an address, defaults to PTR, suggests host
  names of A/AAAA records with that address and warns about a second PTR;
  the record list shows addresses.
- Address match lists (options, view match lists, ACL elements) offer the
  existing ACLs, TSIG keys and built-ins as one-click suggestions and
  flag unknown names.
- Server: in reverse zones a record can be named by its address, and a
  PTR target like nas.example.com without the final dot is read as the
  full host name (a bare label is refused). Warnings noticed while parsing
  record data reach the result again.
- Fixes: brand link hover underline, the dashboard's "New zone" link
  opening the dialog twice.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/engine/expand.go

@@ -528,6 +528,15 @@ func (x *expander) ptrDelete(z *model.Zone, owner string, p *rr.Parsed) []model.
 	return []model.Op{newOp(OpRecordDelete, 0, 0, in, fmt.Sprintf("delete %s IN PTR %s (if present)", ptrName, owner))}
 }
 
+// parseWarnings keeps what parsing noticed (e.g. a name read as absolute).
+// The stored operation holds the canonical data, so applying it doesn't
+// notice again.
+func (x *expander) parseWarnings(owner string, p *rr.Parsed) {
+	for _, w := range p.Warnings {
+		x.warnings = append(x.warnings, fmt.Sprintf("%s %s: %s", dnsname.Display(owner), p.Type, w))
+	}
+}
+
 func (x *expander) recordCreate(req Request) ([]model.Op, error) {
 	var in RecordInput
 	if err := decode(req.Data, &in); err != nil {
@@ -544,6 +553,7 @@ func (x *expander) recordCreate(req Request) ([]model.Op, error) {
 	if err != nil {
 		return nil, err
 	}
+	x.parseWarnings(owner, p)
 	ptr := in.PTR
 	in.ZoneID, in.Zone, in.View, in.PTR = z.ID, "", "", false
 	in.Name, in.Type, in.Data = &owner, &p.Type, &p.Data
@@ -589,6 +599,7 @@ func (x *expander) recordUpdate(req Request) ([]model.Op, error) {
 	if err != nil {
 		return nil, err
 	}
+	x.parseWarnings(owner, p)
 	if in.Name != nil {
 		in.Name = &owner
 	}
@@ -737,6 +748,7 @@ func (x *expander) rrsetReplace(req Request) ([]model.Op, error) {
 		if err != nil {
 			return nil, err
 		}
+		x.parseWarnings(owner, p)
 		canon = append(canon, p.Data)
 	}
 	in.ZoneID, in.Zone, in.View, in.Name, in.Type, in.Data = z.ID, "", "", owner, typ, canon