refactor: extract signals filter builder, add ESLint 10 config, fix low-hanging issues

web/components/ChartCard/usePlot.ts

@@ -1,11 +1,12 @@
-import { useCallback, useEffect, useRef } from 'react';
-import uPlot from 'uplot';
+import { useCallback, useEffect, useRef, type DependencyList } from 'react';
+
+import type uPlot from 'uplot';
 
 export type BuildFn = (
   el: HTMLDivElement,
   w: number,
   h: number,
-  legendRef: React.RefObject<HTMLDivElement>,
+  legendRef: React.RefObject<HTMLDivElement | null>,
 ) => uPlot | null;
 
 /** Converts a data index to the pixel x position uPlot expects for setCursor */
@@ -24,14 +25,13 @@ function idxToPixel(plot: uPlot, idx: number): number {
  */
 export function usePlot(
   build: BuildFn,
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  deps: any[],
+  deps: DependencyList,
 ): {
   containerRef: React.RefObject<HTMLDivElement | null>;
-  legendRef: React.RefObject<HTMLDivElement>;
+  legendRef: React.RefObject<HTMLDivElement | null>;
 } {
   const containerRef = useRef<HTMLDivElement | null>(null);
-  const legendRef = useRef<HTMLDivElement>(null!);
+  const legendRef = useRef<HTMLDivElement>(null);
   const plotRef = useRef<uPlot | null>(null);
   const lastIdxRef = useRef<number>(0);
 
@@ -64,7 +64,8 @@ export function usePlot(
         });
       });
     }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
+    // deps is intentionally dynamic — passed by parent to allow external rebuild triggers
+    // eslint-disable-next-line react-x/exhaustive-deps
   }, deps);
 
   useEffect(() => {