Fix TypeScript and linting errors: type annotations, import order, and unused params

Co-authored-by: alexthemitchell <[email protected]>

Author: Copilot

src/hooks/__tests__/useMultiVfoProcessor.test.ts

@@ -13,7 +13,7 @@ global.AudioContext = jest.fn().mockImplementation(() => ({
   state: "running",
   resume: jest.fn().mockResolvedValue(undefined),
   close: jest.fn().mockResolvedValue(undefined),
-  createBuffer: jest.fn((channels, length, rate) => ({
+  createBuffer: jest.fn((_channels, _length, _rate) => ({
     copyToChannel: jest.fn(),
   })),
   createBufferSource: jest.fn(() => ({

src/hooks/useMultiVfoProcessor.ts

@@ -9,11 +9,11 @@ import { useEffect, useRef, useCallback, useState } from "react";
 import { MultiVfoProcessor } from "../lib/dsp/MultiVfoProcessor";
 import { FMDemodulatorPlugin } from "../plugins/demodulators/FMDemodulatorPlugin";
 import { useVfo, useStore } from "../store";
+import { VfoStatus } from "../types/vfo";
 import { createAudioContext, playAudioBuffer } from "../utils/webAudioUtils";
 import type { IQSample } from "../models/SDRDevice";
 import type { DemodulatorPlugin } from "../types/plugin";
 import type { VfoState } from "../types/vfo";
-import { VfoStatus } from "../types/vfo";
 
 interface UseMultiVfoProcessorOptions {
   /** Hardware center frequency in Hz */
@@ -226,7 +226,7 @@ export function useMultiVfoProcessor(options: UseMultiVfoProcessorOptions): {
 
       // Build VfoState array with demodulators
       const vfoStates: VfoState[] = activeVfos
-        .map((vfo) => {
+        .map((vfo): VfoState | null => {
           const demodulator = vfoDemodulators.current.get(vfo.id);
           if (!demodulator) {
             return null;

src/utils/webAudioUtils.ts

@@ -53,7 +53,7 @@ export function playAudioBuffer(
 
   // Create buffer
   const buffer = context.createBuffer(1, samples.length, sampleRate);
-  buffer.copyToChannel(samples, 0);
+  buffer.copyToChannel(samples as Float32Array<ArrayBuffer>, 0);
 
   // Create source
   const source = context.createBufferSource();
@@ -90,7 +90,7 @@ export function createAudioBufferFromSamples(
   const buffer = context.createBuffer(channels, numFrames, sampleRate);
 
   if (channels === 1) {
-    buffer.copyToChannel(samples, 0);
+    buffer.copyToChannel(samples as Float32Array<ArrayBuffer>, 0);
   } else if (channels === 2) {
     // For stereo, split samples into left and right
     const leftChannel = new Float32Array(numFrames);