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

TODO.md

@@ -45,6 +45,18 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-04: Remembered site permissions are held by full origin
+  ([#402](https://git.eeqj.de/sneak/AutistMask/issues/402)). `allowedSites` and
+  `deniedSites` stored the hostname alone, so a grant to `https://dapp.example`
+  also authorised `http://dapp.example` and every port on that host, and the
+  prompts named only the hostname. Both lists now store and match the origin
+  (`scheme://host[:port]`), the key the connections approved without "Remember"
+  already used, in `src/background/index.js` and in Settings, whose site lists
+  and `AUTISTMASK_REMOVE_SITE` carry the origin too. The connection, transaction
+  and signature prompts show the origin. Entries saved by hostname before this
+  change are not migrated (pre-1.0): they match no site, and Settings lists them
+  until they are removed.
+
 - 2026-10-04: `make test` takes 8-13s on the shared build host, down from
   17-25s, measured in alternating runs before and after the change
   ([#428](https://git.eeqj.de/sneak/AutistMask/issues/428)). Each popup boot in