feat: add release build script

- scripts/build-release.sh: builds, signs, and copies .app to dist/release/
- Bundle targets narrowed to app + dmg
- npm run release convenience script
- README documents the release build workflow

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/build-release.sh

@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+VERSION_FILE="$PROJECT_ROOT/VERSION"
+
+# ── Read and validate version ──────────────────────────────────────
+if [ ! -f "$VERSION_FILE" ]; then
+  echo "ERROR: VERSION file not found" >&2
+  exit 1
+fi
+
+VERSION=$(cat "$VERSION_FILE" | sed 's/^[vV]//' | tr -d '[:space:]')
+
+if ! echo "$VERSION" | grep -qE '^[0-9]+\.[0-9]+\.[0-9]+$'; then
+  echo "ERROR: '$VERSION' is not valid semver (expected X.Y.Z)" >&2
+  exit 1
+fi
+
+echo "=== Building GUI Video Clipper v$VERSION ==="
+echo ""
+
+# ── Install frontend dependencies ──────────────────────────────────
+echo "→ Installing dependencies…"
+cd "$PROJECT_ROOT"
+npm install --silent
+
+# ── Run tauri build ────────────────────────────────────────────────
+echo "→ Building release (this may take a few minutes)…"
+BUILD_LOG=$(mktemp)
+npx tauri build 2>&1 | tee "$BUILD_LOG" | tail -10
+
+# ── Locate built artifacts ─────────────────────────────────────────
+# Parse .app path from tauri build output (handles custom CARGO_TARGET_DIR)
+APP_SRC=$(grep '\.app$' "$BUILD_LOG" | head -1 | sed 's/^[[:space:]]*//')
+DMG_SRC=$(grep '\.dmg$' "$BUILD_LOG" | head -1 | sed 's/^[[:space:]]*//')
+rm -f "$BUILD_LOG"
+
+# Fall back to standard location if parsing failed
+if [ -z "$APP_SRC" ] || [ ! -d "$APP_SRC" ]; then
+  BUNDLE_DIR="$PROJECT_ROOT/src-tauri/target/release/bundle"
+  APP_SRC="$BUNDLE_DIR/macos/GUI Video Clipper.app"
+fi
+
+if [ ! -d "$APP_SRC" ]; then
+  echo "ERROR: .app bundle not found" >&2
+  echo "Check the build output above for errors." >&2
+  exit 1
+fi
+
+# ── Ad-hoc code sign ──────────────────────────────────────────────
+echo "→ Ad-hoc signing .app…"
+codesign --force --deep -s - "$APP_SRC"
+
+# ── Copy to dist/release/ ─────────────────────────────────────────
+DIST_DIR="$PROJECT_ROOT/dist/release"
+mkdir -p "$DIST_DIR"
+
+echo "→ Copying to dist/release/…"
+rm -rf "$DIST_DIR/GUI Video Clipper.app"
+cp -R "$APP_SRC" "$DIST_DIR/"
+
+# Copy DMG if it was built
+DMG_FILE="$DMG_SRC"
+if [ -n "$DMG_FILE" ] && [ -f "$DMG_FILE" ]; then
+  cp "$DMG_FILE" "$DIST_DIR/"
+  echo "  ✓ DMG: $(basename "$DMG_FILE")"
+fi
+
+# ── Summary ────────────────────────────────────────────────────────
+APP_SIZE=$(du -sh "$DIST_DIR/GUI Video Clipper.app" | cut -f1)
+echo ""
+echo "=== Build Complete ==="
+echo "  Version:  v$VERSION"
+echo "  App:      dist/release/GUI Video Clipper.app ($APP_SIZE)"
+if [ -n "$DMG_FILE" ] && [ -f "$DIST_DIR/$(basename "$DMG_FILE")" ]; then
+  DMG_SIZE=$(du -sh "$DIST_DIR/$(basename "$DMG_FILE")" | cut -f1)
+  echo "  DMG:      dist/release/$(basename "$DMG_FILE") ($DMG_SIZE)"
+fi
+echo ""
+echo "To run: open \"dist/release/GUI Video Clipper.app\""