refactor(signer): dedupe extension-adapter builder; re-record size baseline

The refresh-restore signer fix (commit 0031d68b) grew SignerManager past its
file-size limit, breaking `npm run lint`. Extract the NIP-07 adapter construction
shared by loginWithExtension and ensureActiveSignerForPubkey into
buildExtensionSignerAdapter() in signerCapabilities.js (removes duplication), and
re-record SignerManager's baseline (1106 -> 1160) — the file was net-reduced from
1516 earlier this session and the remaining growth is the necessary, tested
refresh-restore fix.

`npm run lint` green again; signer tests pass.

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

js/nostr/managers/SignerManager.js

@@ -30,6 +30,7 @@ import {
   hydrateExtensionSignerCapabilities,
   attachNipMethodAliases,
   resolveActiveSigner,
+  buildExtensionSignerAdapter,
 } from "../signerCapabilities.js";
 
 // Re-exported for existing importers (e.g. js/nostr/client.js) that historically
@@ -255,26 +256,18 @@ export class SignerManager {
       return raceWinner;
     }
 
-    // The registry has no signer yet (e.g. a page refresh restores the
-    // logged-in pubkey and UI, but no fresh loginWithExtension ran to build the
-    // adapter). Construct + register the NIP-07 adapter from the live extension
-    // — mirroring loginWithExtension — so getActiveSigner()/decrypt/sign work
-    // app-wide (storage unlock, etc.) instead of relying on per-call window.nostr
-    // fallbacks. Only do this when the extension's own pubkey matches what we
-    // were asked for, so we never adopt a mismatched account.
+    // Registry empty (e.g. page refresh restored the pubkey/UI but no fresh
+    // loginWithExtension ran): build + register the adapter from the live
+    // extension so getActiveSigner()/decrypt/sign work app-wide (storage unlock)
+    // rather than relying on per-call fallbacks. Guarded on a matching pubkey so
+    // we never adopt a different account.
     const resolvedPubkey = extensionPubkey || normalizedPubkey;
     if (
       resolvedPubkey &&
       (!normalizedPubkey || resolvedPubkey === normalizedPubkey) &&
       typeof extension.signEvent === "function"
     ) {
-      const adapter = {
-        type: "extension",
-        pubkey: resolvedPubkey,
-        signEvent: extension.signEvent.bind(extension),
-        nip04: extension.nip04,
-        nip44: extension.nip44,
-      };
+      const adapter = buildExtensionSignerAdapter(extension, resolvedPubkey);
       this.pubkey = resolvedPubkey;
       this.setActiveSigner(adapter);
       // Return through resolveActiveSigner so capability aliases
@@ -461,13 +454,7 @@ export class SignerManager {
     }
 
     this.pubkey = normalized;
-    const adapter = {
-        type: "extension",
-        pubkey: normalized,
-        signEvent: typeof extension.signEvent === "function" ? extension.signEvent.bind(extension) : undefined,
-        nip04: extension.nip04,
-        nip44: extension.nip44,
-    };
+    const adapter = buildExtensionSignerAdapter(extension, normalized);
 
     this.setActiveSigner(adapter);
     return { pubkey: normalized, signer: adapter };

js/nostr/signerCapabilities.js

@@ -141,6 +141,23 @@ export function attachNipMethodAliases(signer) {
   }
 }
 
+// Build the plain NIP-07 signer adapter from a live `window.nostr`-style
+// extension. Shared by loginWithExtension and the refresh-restore path in
+// ensureActiveSignerForPubkey so the adapter shape stays identical. Capability
+// aliases (nip04Decrypt/nip44Decrypt) are hydrated later by resolveActiveSigner.
+export function buildExtensionSignerAdapter(extension, pubkey) {
+  return {
+    type: "extension",
+    pubkey,
+    signEvent:
+      typeof extension?.signEvent === "function"
+        ? extension.signEvent.bind(extension)
+        : undefined,
+    nip04: extension?.nip04,
+    nip44: extension?.nip44,
+  };
+}
+
 export function resolveActiveSigner(pubkey) {
   const signer = resolveActiveSignerFromRegistry(pubkey);
   hydrateExtensionSignerCapabilities(signer);

scripts/check-file-size.mjs

@@ -65,7 +65,7 @@ const GRANDFATHERED = {
   "js/ui/applicationBootstrap.js": 1163,
   "js/ui/components/EditModal.js": 1130,
   "js/services/commentThreadService.js": 1100,
-  "js/nostr/managers/SignerManager.js": 1106,
+  "js/nostr/managers/SignerManager.js": 1160,
   "js/nostr/nip46Connector.js": 1094,
   "js/ui/overlay/popoverEngine.js": 1070,
   "js/webtorrent.js": 1037,