Recon showed ChannelWatermarkImageSource.ChannelLogo already resolves the
channel's logo artwork at render time, and prod already runs that pattern
by hand (43 channels -> one 'Channel Bug' preset). So #67 is productizing
a proven mechanism, not building one: seed the preset idempotently in
DbInitializer (adopting any existing same-name row untouched), default the
SPA creation paths to it, and add a shared <BugPreview> that renders the
resolved geometry in both the channel editor and WatermarksScreen.
No schema change, no WatermarkSelector change. One additive DTO field
(WatermarkResponseModel.imageSource) under the frozen-additive /api/v1.
Refs #67
timothy
afbd50e3f0