chore: bump version to 1.2.4 - Hardening playback

cc

docs/release-1.2.4/CHANGELOG_FULL.md

@@ -0,0 +1,9 @@
+74e3ba95 chore(logging): reduce noise in default log level
+a279e048 feat(credentials): use XDG portal secret for key derivation
+6da50926 fix(credentials): encrypt OAuth token in keyring
+04eab0d8 fix(credentials): keyring-only storage, no redundant file
+45053122 fix(security): remove hardcoded crypto seed from cmaf crate
+5f154aaf fix(logout): clear stored credentials on logout
+2a6bb658 fix(credentials): improve keyring failure logging visibility
+11bffe70 fix(cmaf): fetch all audio segments (off-by-one in segment loop)
+192f681d fix: bump Cargo.toml version to 1.2.3