fix: ensure not soft logged out in pushhelper

[krille-chan]

fixes an error report in FluffyChat which therefore also can happen in Famedly. Should reduce the amount of unable to fetch events in notifications a little bit.

[cursor]

PR Summary

Low Risk
Single defensive call in an existing error-handling path; no auth or API contract changes beyond refreshing the session before getNotifications().

Overview
When getEventByPushNotification cannot load an event via getOneRoomEvent and falls back to getNotifications(), it now calls ensureNotSoftLoggedOut() immediately before that request.

Push handling often runs with background sync off, so the access token can expire after the existing early ensureNotSoftLoggedOut() at the start of the method. Refreshing again on the fallback path avoids failed /notifications calls and reduces “unable to fetch event” errors for notification-driven flows (e.g. FluffyChat / Famedly).

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.28%. Comparing base (2040db7) to head (2173a42).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/client.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2398      +/-   ##
==========================================
- Coverage   59.29%   59.28%   -0.01%     
==========================================
  Files         161      161              
  Lines       20303    20304       +1     
==========================================
  Hits        12038    12038              
- Misses       8265     8266       +1     

Files with missing lines	Coverage Δ
lib/src/client.dart	78.01% <0.00%> (-0.06%)	⬇️

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