Add Konverter: a local-only menu bar file converter

Drag files in Finder, hold a modifier, and drop on a wheel of outputs.
Conversions run entirely on-device through ImageIO, PDFKit, AVFoundation,
the bundled CLI tools, and optional ffmpeg/LibreOffice.

Includes a --self-test suite (41 checks) and a --convert CLI mode so the
conversion matrix can be verified without the UI.

scripts/make-icon.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Builds Icon.icns from scripts/gen-icon.swift and drops it into Konverter.app.
+# Run ./build-app.sh first (this expects the bundle to exist).
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+APP="Konverter.app"
+if [ ! -d "$APP" ]; then
+    echo "make-icon.sh: $APP not found — run ./build-app.sh first." >&2
+    exit 1
+fi
+
+TMP=$(mktemp -d)
+trap 'rm -rf "$TMP"' EXIT
+
+swift scripts/gen-icon.swift "$TMP/icon-1024.png"
+
+mkdir -p "$TMP/Icon.iconset"
+for s in 16 32 128 256 512; do
+    d=$((s * 2))
+    sips -z "$s" "$s" "$TMP/icon-1024.png" --out "$TMP/Icon.iconset/icon_${s}x${s}.png" >/dev/null
+    sips -z "$d" "$d" "$TMP/icon-1024.png" --out "$TMP/Icon.iconset/icon_${s}x${s}@2x.png" >/dev/null
+done
+
+iconutil -c icns "$TMP/Icon.iconset" -o "$TMP/Icon.icns"
+mkdir -p "$APP/Contents/Resources"
+cp "$TMP/Icon.icns" "$APP/Contents/Resources/Icon.icns"
+echo "Generated $APP/Contents/Resources/Icon.icns"