simplify: DRY up shared changesets, context helpers, LiveView helpers, and structural extraction
- Create MaidenheadChangesetHelpers: consolidate grid validation, callsign
normalization, lat/lon validation, grid/latlon derivation across 6 schemas
- Create ContextHelpers: shared fetch_owned with admin bypass, safe_enqueue
for Oban workers, UUID casting to replace CastError rescues
- Extend LiveHelpers: add current_user/1 (removes 7 duplicate definitions),
subscribe/2 (replaces 13 inline PubSub sites), assign_url_params/2
- Extract Propagation.ScoreStore (528 lines): separate file I/O and cache
management from scoring logic, 13 defdelegate passthroughs
- Split SubmitLive (942->475 lines): extract CSV/ADIF upload rendering into
3 function component modules (csv_upload, adif_upload, preview)
- Update 16 LiveViews to use shared helpers
Graham McIntire
b4b8d4ec47