perf enhancements

src/routes/weather/historical/[location]/HistoricalMeteograms.svelte

@@ -131,15 +131,6 @@
 				>
 				+ scroll to zoom
 			</span>
-			{#if zoomActive}
-				<button
-					type="button"
-					class="flex cursor-pointer items-center gap-1.5 rounded-lg border border-primary/50 bg-primary/10 px-2.5 py-1 text-xs font-semibold text-primary transition-colors hover:bg-primary/15"
-					onclick={resetZoom}
-				>
-					Reset zoom
-				</button>
-			{/if}
 			<button
 				type="button"
 				class="flex cursor-pointer items-center gap-1.5 rounded-lg border border-border bg-card px-3 py-1.5 text-xs font-semibold text-muted-foreground transition-colors hover:border-primary/50 hover:text-foreground disabled:cursor-not-allowed disabled:opacity-50"
@@ -149,6 +140,17 @@
 			>
 				{#if downloadingPng}Rendering…{:else}PNG{/if}
 			</button>
+			<!-- Kept last so toggling it wraps onto a new line instead of shifting
+			     the other controls (no layout shift on mobile). -->
+			{#if zoomActive}
+				<button
+					type="button"
+					class="flex cursor-pointer items-center gap-1.5 rounded-lg border border-primary/50 bg-primary/10 px-2.5 py-1 text-xs font-semibold text-primary transition-colors hover:bg-primary/15"
+					onclick={resetZoom}
+				>
+					Reset zoom
+				</button>
+			{/if}
 		</div>
 	</div>