harden: key remembered site permissions by full origin (closes #402)

allowedSites and deniedSites held the bare hostname, so a grant to
https://dapp.example also authorised http://dapp.example and every port
on that host, and the connection, transaction and signature prompts
named only the hostname. Both lists now store and match the full origin
(scheme://host[:port]), the key the connections approved without
Remember already used. The prompts, the Settings site lists and
AUTISTMASK_REMOVE_SITE use the origin too. Entries saved by hostname
are not migrated (pre-1.0): they match no site.

Model: opus-5-5

src/popup/index.html

@@ -1561,7 +1561,7 @@
                     with extreme caution.
                 </div>
                 <p class="mb-2">
-                    <span id="approve-tx-hostname" class="font-bold"></span>
+                    <span id="approve-tx-origin" class="font-bold"></span>
                     wants to send a transaction.
                 </p>
 
@@ -1662,7 +1662,7 @@
                     funds. Proceed with extreme caution.
                 </div>
                 <p class="mb-2">
-                    <span id="approve-sign-hostname" class="font-bold"></span>
+                    <span id="approve-sign-origin" class="font-bold"></span>
                     wants you to sign a message.
                 </p>
 
@@ -1740,7 +1740,7 @@
                 </div>
                 <div class="mb-3">
                     <p class="mb-2">
-                        <span id="approve-hostname" class="font-bold"></span>
+                        <span id="approve-origin" class="font-bold"></span>
                         wants to connect to your wallet.
                     </p>
                     <div class="text-xs text-muted mb-1">