[admin] fix whitelist/blacklist edits with nsec & NIP-46; loosen file-size limits

Admin list edits worked with a NIP-07 extension but silently failed with nsec and
NIP-46 (Amber). persistNostrState signed with window.nostr.signEvent directly (and
required requestDefaultExtensionPermissions), so non-extension logins threw
"nostr-extension-missing".

Fix: sign with the ACTIVE signer (getActiveSigner() from the registry — extension/nsec/
NIP-46 all expose signEvent), and only run the extension-permission prompt when the
signer is an extension (type extension/nip07). Regression test in
tests/admin-list-store.test.mjs (nsec signer used while window.nostr.signEvent throws).

Also (per maintainer request): raise the file-size lint margins to stop churning on an
arbitrary cap — THRESHOLD 1000→1200 (new files), GROWTH_MARGIN 50→200 (grandfathered).

TODOs added: #42 follow-up audit of every signing path (must use the active signer, not
window.nostr); #43 logged-in profile card at the top of the profile modal (half-on/half-
off); #44 in-modal storage selector + unlock for the upload modal.

Build + lint clean; admin-list suite green.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

scripts/check-file-size.mjs

@@ -19,8 +19,8 @@ import { join, relative } from "node:path";
 
 const ROOT = new URL("..", import.meta.url).pathname.replace(/\/$/, "");
 const SOURCE_DIR = join(ROOT, "js");
-const THRESHOLD = 1000; // lines — new files must stay under this
-const GROWTH_MARGIN = 50; // lines — allowlisted files may grow by this much for minor fixes
+const THRESHOLD = 1200; // lines — new files must stay under this (soft ceiling)
+const GROWTH_MARGIN = 200; // lines — allowlisted files may grow by this much for fixes
 
 // Grandfathered files: path relative to repo root → line count when recorded.
 // These files are known to be oversized and are decomposition targets.