build: add mac icon pipeline

scripts/build_icon.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Render the macOS .icon bundle to a padded .icns like Trimmy's pipeline.
+# Defaults target the Clawdis assets so you can just run the script from repo root.
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+
+ICON_FILE=${1:-"$ROOT_DIR/apps/macos/Icon.icon"}
+BASENAME=${2:-Clawdis}
+OUT_ROOT=${3:-"$ROOT_DIR/apps/macos/build/icon"}
+XCODE_APP=${XCODE_APP:-/Applications/Xcode.app}
+# Where the final .icns should live; override DEST_ICNS to change.
+DEST_ICNS=${DEST_ICNS:-"$ROOT_DIR/apps/macos/Sources/Clawdis/Resources/Clawdis.icns"}
+
+ICTOOL="$XCODE_APP/Contents/Applications/Icon Composer.app/Contents/Executables/ictool"
+if [[ ! -x "$ICTOOL" ]]; then
+  ICTOOL="$XCODE_APP/Contents/Applications/Icon Composer.app/Contents/Executables/icontool"
+fi
+if [[ ! -x "$ICTOOL" ]]; then
+  echo "ictool/icontool not found. Set XCODE_APP if Xcode is elsewhere." >&2
+  exit 1
+fi
+
+ICONSET_DIR="$OUT_ROOT/${BASENAME}.iconset"
+TMP_DIR="$OUT_ROOT/tmp"
+mkdir -p "$ICONSET_DIR" "$TMP_DIR"
+
+MASTER_ART="$TMP_DIR/icon_art_824.png"
+MASTER_1024="$TMP_DIR/icon_1024.png"
+
+# Render inner art (no margin) with macOS Default appearance
+"$ICTOOL" "$ICON_FILE" \
+  --export-preview macOS Default 824 824 1 -45 "$MASTER_ART"
+
+# Pad to 1024x1024 with transparent border
+sips --padToHeightWidth 1024 1024 "$MASTER_ART" --out "$MASTER_1024" >/dev/null
+
+# Generate required sizes
+sizes=(16 32 64 128 256 512 1024)
+for sz in "${sizes[@]}"; do
+  out="$ICONSET_DIR/icon_${sz}x${sz}.png"
+  sips -z "$sz" "$sz" "$MASTER_1024" --out "$out" >/dev/null
+  if [[ "$sz" -ne 1024 ]]; then
+    dbl=$((sz*2))
+    out2="$ICONSET_DIR/icon_${sz}x${sz}@2x.png"
+    sips -z "$dbl" "$dbl" "$MASTER_1024" --out "$out2" >/dev/null
+  fi
+done
+
+# 512x512@2x already covered by 1024; ensure it exists
+cp "$MASTER_1024" "$ICONSET_DIR/icon_512x512@2x.png"
+
+iconutil -c icns "$ICONSET_DIR" -o "$OUT_ROOT/${BASENAME}.icns"
+
+mkdir -p "$(dirname "$DEST_ICNS")"
+cp "$OUT_ROOT/${BASENAME}.icns" "$DEST_ICNS"
+
+echo "Icon.icns generated at $DEST_ICNS"