fix: enforce content security policy#138
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Summary\n- Add a restrictive Content Security Policy meta tag for same-origin scripts/styles and safer defaults\n- Move button behavior out of inline onclick handlers so the CSP can block inline script execution\n- Render task rows with DOM nodes instead of innerHTML while preserving task toggle/delete behavior\n\n## Validation\n- node --check script.js\n- git diff --check\n- Served index.html locally with python3 -m http.server and verified the CSP markup is present\n\nCloses #132