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/rr/rr_test.go

@@ -157,3 +157,21 @@ func TestParseErrorText(t *testing.T) {
 		}
 	}
 }
+
+func TestPTRTargetsInReverseZones(t *testing.T) {
+	zone := "0.10.10.in-addr.arpa."
+	p, err := Parse(zone, "20."+zone, "PTR", "nas.adbraun.lol")
+	if err != nil || p.Data != "nas.adbraun.lol." || len(p.Warnings) != 1 {
+		t.Errorf("unqualified PTR target: %v %+v", err, p)
+	}
+	if p, err := Parse(zone, "20."+zone, "PTR", "nas.adbraun.lol."); err != nil || p.Data != "nas.adbraun.lol." || len(p.Warnings) != 0 {
+		t.Errorf("qualified PTR target: %v %+v", err, p)
+	}
+	if _, err := Parse(zone, "20."+zone, "PTR", "nas"); err == nil {
+		t.Error("a single-label PTR target inside the reverse zone was accepted")
+	}
+	// Forward zones keep zone-file semantics.
+	if p, err := Parse("adbraun.lol.", "x.adbraun.lol.", "CNAME", "nas"); err != nil || p.Data != "nas.adbraun.lol." {
+		t.Errorf("forward CNAME: %v %+v", err, p)
+	}
+}