fix: align navbar with landing content

[montasim]

Summary

• move responsive page gutters from the navbar inner container to the header shell
• align the VidQuery logo with the hero left edge
• align the download action with the product demo right edge

Validation

• pnpm check:web
• pnpm check via commit hook
• verified at a 1900 x 1010 viewport matching the deployed-page capture

[netlify]

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