docs(comments): correct comments the cuts left stale

The registration language is read today (preferences.language, the mail language); the Modal and
the players order against popovers through layerStack, not the FloatingTree; the upload's auth
dependency is current_user; the module of access tests covers onboarding and access, not only the
canonical email. The dev proxy's WebSocket upgrade served the removed messages socket and goes; the
test compose header says a pure-logic run needs SIFTLODE_TEST_REQUIRE_DB=0; the speed measure no
longer reports an unreachable database as "no share link".

frontend/e2e/speed.measure.ts

@@ -38,19 +38,17 @@ function shareTokens(): string[] {
     " join media_assets a on a.id = j.asset_id" +
     " where l.password_hash is null and (l.expires_at is null or l.expires_at > now())" +
     " and a.status = 'ready' order by l.id";
-  try {
-    const out = execFileSync(
-      "docker",
-      ["exec", CONTAINER, "psql", "-U", "siftlode", "-d", "siftlode", "-tAc", sql],
-      { encoding: "utf8" },
-    );
-    return out
-      .split("\n")
-      .map((t) => t.trim())
-      .filter(Boolean);
-  } catch {
-    return [];
-  }
+  // Not caught: a database this cannot reach (no docker, a renamed container) is a failed
+  // measurement, not "no playable share link on the local stack".
+  const out = execFileSync(
+    "docker",
+    ["exec", CONTAINER, "psql", "-U", "siftlode", "-d", "siftlode", "-tAc", sql],
+    { encoding: "utf8" },
+  );
+  return out
+    .split("\n")
+    .map((t) => t.trim())
+    .filter(Boolean);
 }
 
 test("speed baseline", async ({ browser, page: page0 }) => {