- New SourceFiltersScreen with All toggle + add/remove of specific
installer package names. Backed by PREFERENCE_FILTER_INSTALLERS
(Set<String>); PREFERENCE_FILTER_AURORA_ONLY preserved as the All
switch for backward compat.
- UpdateWorker reads installer via getInstallSourceInfo (R+) / falls
back to deprecated getInstallerPackageName below.
- UpdatesPreferenceScreen: "Filter F-Droid apps" moved to Advanced;
"Filter apps from other sources" becomes a navigation row to the
new sub-screen with a state summary.
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