Fix timer tests and add baseline screenshot update script

- Fix timer.spec.ts button click coordinates (slow: y=125, fast: y=265, reset: y=390)
- Add scripts/update-baseline-screenshots.sh for updating baselines
- Update all baseline screenshots

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

scripts/update-baseline-screenshots.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# Update baseline screenshots from test results
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TESTS_DIR="$SCRIPT_DIR/../tests"
+SOURCE_DIR="$TESTS_DIR/test-results"
+DEST_DIR="$TESTS_DIR/baseline-screenshots"
+
+if [ ! -d "$SOURCE_DIR" ]; then
+    echo "Error: test-results directory not found at $SOURCE_DIR"
+    echo "Run 'npm test' first to generate screenshots"
+    exit 1
+fi
+
+mkdir -p "$DEST_DIR"
+
+count=$(ls -1 "$SOURCE_DIR"/*.png 2>/dev/null | wc -l)
+if [ "$count" -eq 0 ]; then
+    echo "No screenshots found in $SOURCE_DIR"
+    exit 1
+fi
+
+echo "Copying $count screenshots to baseline..."
+cp "$SOURCE_DIR"/*.png "$DEST_DIR/"
+
+echo "Updated baseline screenshots:"
+ls -1 "$DEST_DIR"/*.png | wc -l
+echo "screenshots in $DEST_DIR"