fix: suppress map renders during resize drag (#728)

* fix: suppress map renders during resize drag for smoother UX

- Add isResizing flag to DeckGLMap and MapComponent
- Suppress ResizeObserver callbacks during active drag
- Set trackResize: false on maplibre to prevent redundant resizes
- Move render() call from mousemove to mouseup (single clean render)
- Add overflow: hidden to .map-section to prevent visual overflow
- Lower minimum map height from 400px to 350px

Co-authored-by: danielimad <daniel_t_air@hotmail.com>

* fix: prevent stuck isResizing via centralized endResize

Extract endResize() and trigger from mouseup, window blur, and
visibilitychange to prevent permanently suppressed ResizeObserver
if mouseup is missed (e.g. alt-tab during drag).

---------

Co-authored-by: danielimad <daniel_t_air@hotmail.com>

src/styles/main.css

@@ -749,6 +749,7 @@ canvas,
   flex-direction: column;
   flex-shrink: 0;
   position: relative;
+  overflow: hidden;
 }
 
 .map-section.hidden {