docs(release): add intra-refresh coverage to beta.2

The accepted AMF Intra Refresh PR is part of the corrected prerelease.

Add its client-requested GDR behavior to the release note before the paired tags are retargeted.

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Model: GPT 5.6-Terra Ultra

Author: Nonary

release_notes/1.19.0-beta.2.md

@@ -6,6 +6,7 @@ Notice: Vibeshine may trigger false-positive antivirus alerts. Details and worka
 - Made Remote Input and Remote Monitor editable library entries, with artwork and per-entry runtime overrides that apply for each remote session.
 - Moved command preparation to Everyday > Automation & scripting and made its editor clearer when no commands are configured.
 - Added a Remote Monitor option that lets additional clients end a session with one Terminate request.
+- Added AMD HEVC Intra Refresh (GDR) handling for clients that explicitly request it.
 
 ## Fixes
 - Fixed Remote Monitor sessions muting host audio; host playback now remains on while the Remote Monitor audio setting still controls capture and streaming.