Three related bugs in the maplibre reactive signal plumbing:
1. Draggable marker coordinates never updated because dragendHandlerJS
queries for hidden inputs matching LngSignal/LatSignal IDs, but
Element() never rendered those inputs. Add them after the marker
data-effect divs.
2. Click-to-place marker didn't appear until moveend because Element()
rendered a bare hidden input for each event signal, colliding with
the user's action-bearing input (same data-bind, querySelector finds
the bare one first). Remove the internal event inputs — the user
provides their own via MapEvent.Input().
3. The moveend handler dispatched 'input' on ALL data-bind inputs in
the wrapper, accidentally triggering event inputs. Add an else-return
so only the 5 viewport signal inputs get dispatched.
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