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* feat(epg): manual EPG mapping for Stalker portals Extends the manual EPG-to-channel mapping (PR #1165) to Stalker: - shared key helper buildStalkerEpgMappingKey — playlist-scoped stalker:{playlistId}:{channelId} keys, mirroring the Xtream scheme - ITV sidebar: right-click context menu with "Map EPG channel"; after the dialog closes with a change, the bulk EPG cache is rebuilt so the panel and row previews reflect the new mapping immediately - withStalkerEpg().applyMappedItvEpg(): batch-resolves mappings for rendered channels (one getEpgMappingsBatch IPC per new id set) and overlays uploaded-XMLTV programs onto bulkItvEpgByChannel; overrides survive ensureBulkItvEpg reloads - stream-resolver: mapping check in loadStalkerEpgItems (detail) and batched prefetch in loadStalkerEpgBatch (previews); mappingCandidateKeys/prefetchEpgMappings generalized beyond Xtream - global favorites: stalker branch for the Map-EPG menu entry (item id extracted from the stalker::{playlistId}::{id} uid) - docs: manual-mapping section in docs/architecture/stalker-epg.md and a CLAUDE.md EPG bullet covering the whole mapping feature - tests: applyMappedItvEpg suite, stalker preview mapping in the stream-resolver spec, key-builder specs Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(epg): harden Stalker mapping edges found in adversarial review - stream-resolver: stalker items resolve only the playlist-scoped mapping key — bare tvgId/name candidates (tvgId mirrors the raw provider id) could only produce false matches against unrelated M3U mappings, and previews would disagree with the detail path - applyMappedItvEpg: staleness guard after every await so an in-flight call cannot write portal A's mapped EPG into portal B's state after a playlist switch (the store is a root singleton) - applyMappedItvEpg: ids are marked checked only after a successful lookup — a transient IPC failure no longer suppresses the mapping for the rest of the session - live layout: post-dialog refresh re-applies overrides for the unfiltered channel list, so an active search cannot drop the playing channel's mapping - global favorites: new epgMappingChanged output emitted when the dialog actually changed a mapping; unified live tab reloads its EPG previews in response Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>