chore(deps): matrix-js-sdk 41.7 -> 44.0 (#201)

Picks up three releases of MatrixRTC / delayed-event fixes and
matrix-sdk-crypto-wasm 18.3.1 -> 18.9.0.

SDK 43 moved OAuth (MSC3861) into the SDK and dropped oidc-client-ts, so
the native-OAuth sign-in is ported:
- login discovers the auth server via /auth_metadata, registers with
  OAuth2.registerClient, and keeps the PKCE verifier + device in its own
  sessionStorage entry keyed by `state` (single use; CSRF check);
- refresh is done by the SDK (oauthClientId + onTokenRefresh); the #16
  cross-tab protection is kept by a narrow guard on refresh-token grants
  (the SDK calls the global fetch for OAuth, not fetchFn), which
  serialises them with a Web Lock and adopts a sibling tab's tokens;
- logout and forced logout revoke via mx.logout() (the SDK revokes at
  the auth server for OAuth sessions);
- the callback page parsed its params on every render, re-running the
  single-use code exchange in a loop; parsed once now.

Also: notification_type is deprecated in MSC4075 (ring in DMs, notify
elsewhere when omitted), _onRTCSessionMemberUpdate ->
ensureRecalculateSessionMembers, precache limit 6 -> 10 MB for the
7.8 MB crypto wasm.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

package.json

@@ -80,7 +80,7 @@
     "katex": "0.18.11",
     "linkify-react": "4.3.3",
     "linkifyjs": "4.3.3",
-    "matrix-js-sdk": "41.7.0",
+    "matrix-js-sdk": "44.0.0",
     "matrix-widget-api": "1.18.0",
     "millify": "6.1.0",
     "pdfjs-dist": "6.3.289",