chore(deps): matrix-js-sdk 41.6.0-rc.0 → 41.7.0 stable

Off the release candidate onto stable: pulls matrix-sdk-crypto-wasm 18.3.1 (a
security update) + MSC4140 delayed-event auth fixes. Thread/receipt API
signatures spot-checked unchanged (sendEvent threadId overloads, sendReceipt
unthreaded arg). Gates green: tsc/build/658 tests. E2EE runtime behavior needs
the usual live smoke (send/receive in an encrypted room, call keys).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -77,7 +77,7 @@
     "katex": "0.16.11",
     "linkify-react": "4.3.3",
     "linkifyjs": "4.3.3",
-    "matrix-js-sdk": "41.6.0-rc.0",
+    "matrix-js-sdk": "41.7.0",
     "matrix-widget-api": "1.17.0",
     "millify": "6.1.0",
     "pdfjs-dist": "5.7.284",