refactor: Convert to UV Python project with proper package structure

- Restructured project to use src/stocktool package layout
- Migrated to UV for dependency management
- Added pyproject.toml with all dependencies (sv-ttk, pillow, requests, pyyaml)
- Organized test files into tests/ directory
- Updated .gitignore for UV projects
- Comprehensive README with installation and usage instructions
- Removed old unused files (main.py, stock_tool_gui.py, duplicate copy)
- Added CLI entry point: stock-tool command

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

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

.claude/skills/webapp-testing/examples/static_html_automation.py

@@ -0,0 +1,33 @@
+from playwright.sync_api import sync_playwright
+import os
+
+# Example: Automating interaction with static HTML files using file:// URLs
+
+html_file_path = os.path.abspath('path/to/your/file.html')
+file_url = f'file://{html_file_path}'
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True)
+    page = browser.new_page(viewport={'width': 1920, 'height': 1080})
+
+    # Navigate to local HTML file
+    page.goto(file_url)
+
+    # Take screenshot
+    page.screenshot(path='/mnt/user-data/outputs/static_page.png', full_page=True)
+
+    # Interact with elements
+    page.click('text=Click Me')
+    page.fill('#name', 'John Doe')
+    page.fill('#email', 'john@example.com')
+
+    # Submit form
+    page.click('button[type="submit"]')
+    page.wait_for_timeout(500)
+
+    # Take final screenshot
+    page.screenshot(path='/mnt/user-data/outputs/after_submit.png', full_page=True)
+
+    browser.close()
+
+print("Static HTML automation completed!")