New logo: diagonal transfer arrows + lock (SVG-first icon pipeline)

Glyph composed from mynaui arrow-diagonal-one (both diagonals) with the
mini-lock of lock-square centered between them — the macOS squircle plays the
role of lock-square's outer square. Indigo gradient + white strokes + amber
lock face for the app icon; a pure black+alpha variant for the macOS template
tray icon, plus 21 pre-rendered tray progress frames (faded arrows + fill bar,
0-100% in 5% steps) for the upcoming tray feature.

Pipeline: scripts/gen-icons.ts renders every size directly from the SVGs with
@resvg/resvg-js (dev-only dep, prebuilt binaries, no postinstall); replaces
make-icon.py + gen-iconset.sh and the sips/iconutil path.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/gen-icons.ts

@@ -0,0 +1,53 @@
+// Regenerate every raster icon asset from the SVG sources (dev-time only).
+//   bun scripts/gen-icons.ts
+// Produces: assets/icon.png (1024), assets/icon.iconset/* (macOS app icon),
+// assets/tray/tray-44-template.png, assets/tray/progress/p{0..100}.png.
+import { mkdir } from "node:fs/promises";
+import path from "node:path";
+import { Resvg } from "@resvg/resvg-js";
+
+const root = path.join(import.meta.dir, "..");
+const assets = path.join(root, "assets");
+
+function renderPng(svg: string, sizePx: number): Uint8Array {
+	const resvg = new Resvg(svg, { fitTo: { mode: "width", value: sizePx } });
+	return resvg.render().asPng();
+}
+
+async function writePng(file: string, svg: string, sizePx: number): Promise<void> {
+	await mkdir(path.dirname(file), { recursive: true });
+	await Bun.write(file, renderPng(svg, sizePx));
+}
+
+// ---- app icon: iconset rendered per size (crisper than downscaling) ----
+const logo = await Bun.file(path.join(assets, "logo.svg")).text();
+await writePng(path.join(assets, "icon.png"), logo, 1024);
+for (const size of [16, 32, 128, 256, 512]) {
+	await writePng(path.join(assets, "icon.iconset", `icon_${size}x${size}.png`), logo, size);
+	await writePng(path.join(assets, "icon.iconset", `icon_${size}x${size}@2x.png`), logo, size * 2);
+}
+
+// ---- tray base (22pt status item @2x) ----
+const trayGlyph = await Bun.file(path.join(assets, "tray", "tray-glyph.svg")).text();
+await writePng(path.join(assets, "tray", "tray-44-template.png"), trayGlyph, 44);
+
+// ---- tray progress frames: faded arrows + centered bar filled to pct ----
+function progressSvg(pct: number): string {
+	const trackX = 4;
+	const trackW = 16;
+	const fillW = (trackW * pct) / 100;
+	return `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <g fill="none" stroke="#000" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" opacity="0.35">
+    <path d="M9.2 9.2 4.6 4.6m0 0v4.2m0-4.2h4.2"/>
+    <path d="m14.8 14.8 4.6 4.6m0 0v-4.2m0 4.2h-4.2"/>
+  </g>
+  <rect x="${trackX}" y="10.7" width="${trackW}" height="2.6" rx="1.3" fill="#000" opacity="0.25"/>
+  ${fillW > 0 ? `<rect x="${trackX}" y="10.7" width="${fillW.toFixed(2)}" height="2.6" rx="1.3" fill="#000"/>` : ""}
+</svg>`;
+}
+
+for (let pct = 0; pct <= 100; pct += 5) {
+	await writePng(path.join(assets, "tray", "progress", `p${pct}.png`), progressSvg(pct), 44);
+}
+
+console.log("icons regenerated: app iconset, tray template, 21 progress frames");