fix: allow full PDF download via free query param

[fellnerse]

Summary

• Restore the ability to generate a full PDF when the ?free query parameter is present in the URL
• Uses the in operator to check for parameter presence rather than truthiness, so ?free, ?free=, and ?free=1 all work correctly
• Safely handles undefined $route or query with optional chaining and nullish coalescing

Test plan

• Visit the analyze page without ?free → sample button should generate a sample PDF
• Visit with ?free → sample button should generate a full PDF
• Visit with ?free= → full PDF
• Visit with ?free=1 → full PDF

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[github-actions]

Visit the preview URL for this PR (updated for commit a69eb0b):

https://whatsanalyze-80665--pr377-fix-free-query-param-34vsso6f.web.app

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