Add 'now' global function to Jinja2 templates

The footer template uses now().year for the copyright date.

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

node_modules/resolve/test/node_path/x/aaa/index.js

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+module.exports = 'A';

node_modules/resolve/test/node_path/x/ccc/index.js

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+module.exports = 'C';

node_modules/resolve/test/node_path/y/bbb/index.js

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+module.exports = 'B';

node_modules/resolve/test/node_path/y/ccc/index.js

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+module.exports = 'CY';