fix(bokeh): use system chromedriver for PNG export

Remove webdriver-manager dependency and use system chromedriver directly.
This is more reliable in CI environments where Chrome/Chromium and
chromedriver are pre-installed.

Changes:
- Remove webdriver-manager import
- Use Service() without explicit driver path
- Add --headless=new and --disable-gpu flags for better compatibility

Author: github-actions[bot]

plots/bokeh/line/line-basic/default.py

@@ -10,7 +10,6 @@
 from selenium import webdriver
 from selenium.webdriver.chrome.options import Options
 from selenium.webdriver.chrome.service import Service
-from webdriver_manager.chrome import ChromeDriverManager
 
 
 # Data
@@ -35,13 +34,15 @@
 p.yaxis.major_label_text_font_size = "16pt"
 p.grid.grid_line_alpha = 0.3
 
-# Setup Chrome webdriver for PNG export (uses webdriver-manager to auto-install driver)
+# Setup Chrome/Chromium webdriver for PNG export
 chrome_options = Options()
-chrome_options.add_argument("--headless")
+chrome_options.add_argument("--headless=new")
 chrome_options.add_argument("--no-sandbox")
 chrome_options.add_argument("--disable-dev-shm-usage")
+chrome_options.add_argument("--disable-gpu")
 
-service = Service(ChromeDriverManager().install())
+# Use system chromedriver
+service = Service()
 driver = webdriver.Chrome(service=service, options=chrome_options)
 
 # Save