feat(image): enhance image handling with new properties and responsive support

- Updated PostEntry type to include _rawImageUrl and _imageFocal for improved image management.
- Refactored image handling in various components to utilize the new properties, ensuring better focal point support and responsive image rendering.
- Introduced warmResponsiveImage function for pre-fetching image variants to optimize loading performance.
- Replaced CmsImage component with RustyImage in multiple blocks for consistent image processing.

src/lib/blog-utils.ts

@@ -258,7 +258,14 @@ export async function loadPostsList(opts: {
             focalX: field.focal?.x,
             focalY: field.focal?.y,
           });
-          (post as PostEntry & { _resolvedImageUrl?: string })._resolvedImageUrl = url;
+          const p = post as PostEntry & {
+            _resolvedImageUrl?: string;
+            _rawImageUrl?: string;
+            _imageFocal?: { x: number; y: number } | null;
+          };
+          p._resolvedImageUrl = url;
+          p._rawImageUrl = field.url;
+          p._imageFocal = field.focal ?? null;
         } catch {
           /* image optional */
         }
@@ -440,9 +447,14 @@ export async function resolvePostOverviewBlocks(
                 focalX: field.focal?.x,
                 focalY: field.focal?.y,
               });
-              (
-                post as PostEntry & { _resolvedImageUrl?: string }
-              )._resolvedImageUrl = url;
+              const p = post as PostEntry & {
+                _resolvedImageUrl?: string;
+                _rawImageUrl?: string;
+                _imageFocal?: { x: number; y: number } | null;
+              };
+              p._resolvedImageUrl = url;
+              p._rawImageUrl = field.url;
+              p._imageFocal = field.focal ?? null;
             } catch {
               // Bild optional
             }