feat: resizable divider in Time Dimension Detail view

[nishantmonu51]

• Add a draggable divider between the timeseries chart and the detail table in the Time Dimension Detail view, so users can adjust how much vertical space each gets. This mirrors the existing resizable split between the timeseries and leaderboards in explore.
• The resizable dimension is the chart's height; the detail table fills the remaining space. Double-click resets to the default. Reuses the existing Resizer component in its vertical (NS) mode.
• Persist the resize selection to localStorage so the split survives navigation:
  • tddChartHeight for the Time Dimension Detail view.
  • exploreTimeseriesWidth for the explore timeseries/leaderboard split (previously not persisted).

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'm proud of this work!

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Developed in collaboration with Claude Code

[nishantmonu51]

Thanks @AdityaHegde .