Footer improvements, duration fix, and version bump to 0.9.0

[minskya]

Summary

• YouTube tutorial link in footer
• New version notification — fetches latest version from Sonatype Central and shows a chip if a newer version is available (semver comparison, silently fails if unreachable)
• Duration display fix — nodes with duration=0 now show "0 ms" instead of being hidden (>= 0 instead of > 0 in SQLNodeStageReducer.ts)
• Version bump to 0.9.0 across build.sbt, package.json, pyspark examples, and clean-and-setup.sh

Changed files

File	Change
spark-ui/src/components/Footer.tsx	Added YouTube button, version check from Sonatype Central with semver comparison, update notification chip
spark-ui/src/reducers/SQLNodeStageReducer.ts	Changed durationMs > 0 to durationMs >= 0 so zero durations are displayed
spark-plugin/build.sbt	Version bump 0.8.10 → 0.9.0
spark-ui/package.json	Version bump 0.8.10 → 0.9.0
spark-plugin/clean-and-setup.sh	Version bump 0.8.10 → 0.9.0
spark-plugin/pyspark-testing/dataflint_pyspark_example.py	Version bump 0.8.10 → 0.9.0
spark-plugin/pyspark-testing/dataflint_pyspark_example_test.py	Version bump 0.8.10 → 0.9.0

Test plan

• Footer shows YouTube Tutorial button that opens the correct URL
• New version chip appears only when Maven version is strictly newer than current
• No chip shown when current version is equal or newer
• No chip shown when Sonatype is unreachable
• Nodes with duration=0 now display "0.0% - 0 ms" in the UI
• Version is 0.9.0 in all references

🤖 Generated with Claude Code

[notion-workspace]

Duration not showing 0 on ui