fix: remove extra fixed canvas top margin

apps/docs/docs/management/boards/index.mdx

@@ -29,7 +29,8 @@ the current viewport.
 
 By default, Homarr fits the complete fixed-proportion tile grid to the available width. Enable **Fixed scaling** in the
 board's Layout settings to render each top-level `1 × 1` tile at the configured CSS-pixel size instead. A fixed dashboard is
-centred when it fits and scrolls both horizontally and vertically when it does not.
+centred when it fits and scrolls both horizontally and vertically when it does not, without adding extra space above
+the board.
 
 The column count is the maximum total for that layout, including any fixed sidebars. For example, a Base layout with
 five columns and no sidebars remains a centred five-column dashboard on an ultrawide screen. **Reset from Base**

apps/nextjs/src/components/board/board-layout-thumbnail-canvas.tsx

@@ -57,8 +57,7 @@ export const BoardLayoutThumbnailCanvas = ({ preview, label, canvas, className }
   const pitch = LOGICAL_GRID_PITCH * metrics.scale;
   const canvasOffset = Math.max(0, (screenWidth - 32 - metrics.width) / 2);
   const contentWidth = Math.max(screenWidth, metrics.width + 32);
-  let canvasTop = 16;
-  if (settings.fixedScaling) canvasTop += 32 * metrics.scale;
+  const canvasTop = 16;
   const contentHeight = rowCount * pitch + canvasTop + 16;
   const itemsById = new Map(preview.items.map((item) => [item.id, item]));
   const stationaryBackground = settings.fixedScaling || settings.backgroundImageAttachment === "fixed";

apps/nextjs/src/components/board/items/widget-hover-overlay.module.css

@@ -18,6 +18,11 @@
   transform: translateY(calc(-100% - 8px));
 }
 
+/* Keep first-row labels inside the scrollport without adding space above the board. */
+:global([data-canvas-scaling="fixed"] [data-grid-y="0"] > .board-grid-content-mount) > .wrapper {
+  transform: translateY(8px);
+}
+
 .panel {
   @mixin dark {
     --background-color: rgb(from var(--mantine-color-dark-7) r g b / 0.96);

apps/nextjs/src/components/board/layout/scaled-board-canvas.module.css

@@ -31,11 +31,6 @@
   margin-inline: auto;
 }
 
-.viewport[data-canvas-scaling="fixed"] .sizer {
-  /* Leave room for edit labels and controls that intentionally sit above first-row tiles. */
-  margin-block-start: calc(2rem * var(--board-canvas-scale, 1));
-}
-
 .viewport[data-canvas-scaling="fixed"] .canvas {
   /* Fixed size describes every painted tile, including container sections. */
   --board-grid-item-inset: calc(var(--board-grid-card-inset, 10px) * var(--board-canvas-inverse-scale, 1));