appview/follow: fix html IDs for did-webs

this bug prevented following did:web accounts on tangled... because of a
htmx target error.

Signed-off-by: oppiliappan <[e-mail]>

appview/pages/funcmap.go

···
 		},
 
 		"normalizeForHtmlId": func(s string) string {
-			// TODO: extend this to handle other cases?
-			return strings.ReplaceAll(s, ":", "_")
+			normalized := strings.ReplaceAll(s, ":", "_")
+			normalized = strings.ReplaceAll(normalized, ".", "_")
+			return normalized
 		},
 		"sshFingerprint": func(pubKey string) string {
 			fp, err := crypto.SSHFingerprint(pubKey)

appview/state/follow.go

···
 	subjectIdent, err := s.idResolver.ResolveIdent(r.Context(), subject)
 	if err != nil {
 		log.Println("failed to follow, invalid did")
+		return
 	}
 
 	if currentUser.Did == subjectIdent.DID.String() {