v26.04.2

mautrix-teams 26.04.2 brings live incoming-call notices, fixes the bot
avatar that re-uploaded on every restart, and patches the OAuth bearer
prerequisite so the skype-token refresh recovers cleanly when Azure
revokes a bearer ahead of its stored expiry.

Added

• Incoming Teams calls now post a live 📲 Incoming call from <name>
  notice in the caller's DM portal within ~1s of the ring, with a
  self-mention so Element fires a Matrix push notification.
• Post-call summaries from the 48:calllogs system thread are parsed and
  re-routed to the real conversation portal (DM partner for 1:1, thread
  for group calls) instead of opening a virtual 48:calllogs portal that
  the Teams API rejects with HTTP 400.
• Call notices include direction, caller display name (with cache fallback
  for outgoing calls where Teams omits targetParticipant.displayName),
  and call duration when available. Self-calls and voicemail legs are
  skipped.

Fixed

• Bot avatar is no longer re-uploaded on every restart. The mxc cache
  file now lives in the bridge working directory (writable under the
  systemd unit's ReadWritePaths) so PrivateTmp=yes no longer wipes it
  on boot.
• RefreshSkypeToken now refreshes the OAuth bearer first when the
  cached one has expired, and retries once on a 401 from the authz
  endpoint. This was masking expired-bearer cases as msteams: token expired and stalling read receipts and outbound Matrix events between
  full reconnect cycles.

Full Changelog: v26.04.1...v26.04.2