perf(camera): remove redundant mkdir subprocess

scripts/test-camera-capture-single-encode.mjs

@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const cameraExtensionPath = path.join(root, 'src/renderer/src/CameraExtension.tsx');
+const mainPath = path.join(root, 'src/main/main.ts');
+
+test('Camera capture save path avoids redundant mkdir subprocess', async (t) => {
+  await t.test('camera capture writes image bytes without shelling out for mkdir', () => {
+    const source = fs.readFileSync(cameraExtensionPath, 'utf8');
+
+    assert.ok(!source.includes('/bin/mkdir'));
+    assert.ok(!source.includes("['-p', saveDir]"));
+    assert.ok(source.includes('const saveDir = homeDir ? `${homeDir}/Pictures/SuperCmd Captures` : \'/tmp/SuperCmd Captures\';'));
+    assert.ok(source.includes('const savePath = `${saveDir}/supercmd-capture-${timestamp}.png`;'));
+    assert.ok(source.includes('const bytes = new Uint8Array(await captureBlob.arrayBuffer());'));
+    assert.ok(source.includes('await window.electron.fsWriteBinaryFile(savePath, bytes);'));
+  });
+
+  await t.test('fsWriteBinaryFile IPC creates parent directories recursively', () => {
+    const source = fs.readFileSync(mainPath, 'utf8');
+    const mkdirLine = 'await fs.promises.mkdir(nodePath.dirname(filePath), { recursive: true });';
+    const writeLine = 'await fs.promises.writeFile(filePath, Buffer.from(data));';
+
+    assert.ok(source.includes("ipcMain.handle('fs-write-binary-file'"));
+    assert.ok(source.includes(mkdirLine));
+    assert.ok(source.includes(writeLine));
+    assert.ok(source.indexOf(mkdirLine) < source.indexOf(writeLine));
+  });
+});

src/renderer/src/CameraExtension.tsx

@@ -323,7 +323,6 @@ const CameraExtension: React.FC<CameraExtensionProps> = ({ onClose }) => {
     let savedToDisk = false;
     if (captureBlob) {
       try {
-        await window.electron.execCommand('/bin/mkdir', ['-p', saveDir], {});
         const bytes = new Uint8Array(await captureBlob.arrayBuffer());
         await window.electron.fsWriteBinaryFile(savePath, bytes);
         savedToDisk = true;