Export canvas tab groups to PDF

[nishantmonu51]

Adds PDF export support for canvas dashboards containing tab groups.

• Lets users export every tab or only each group active tab.
• Flattens exported tabs into labeled rows while preserving dashboard order.
• Includes tab labels in PDF capture and adds localized option copy.
• Covers capture ordering and row grouping with unit tests.

Validation:

• npm run test -w web-common -- src/features/exports/pdf (22 tests passed)
• Prettier check passed for all changed files
• ESLint completed with no errors

Sample Exports with tab groups -
executive-summary-report-20260722-090415.pdf
executive-summary-report-20260722-090345.pdf

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I am proud of this work!

[nishantmonu51]

@codex: review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 27e427abf6

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