feat(street-level): KartaView's SINCE is its upload date, noted in the panel

KartaView's server filters by upload date only, so SINCE goes by it
throughout for KartaView: the lines (as before), the photo a click opens
and the cones, the cut-off taken as its UTC day as KartaView's startDate
(passesKartaViewFilter). Providers may declare sinceBasis: 'upload'
(validated); while one is lit the panel shows "KartaView: by upload date"
under the SINCE slider, read out with it. The gate checks the note, and
step 13's picks get 60 s on a loaded machine.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/streetLevelPresentation.js

@@ -224,6 +224,7 @@ export function presentStreetLevelPanel(state, { now = Date.now() } = {}) {
       since: state.filterControls?.since !== false,
     },
     since: presentSince(filter.sinceDays, now),
+    sinceNote: state.sinceNote || null,
     legend: state.legend || [],
     viewer: presentViewer(state),
     meta: presentMeta(state),