[yuseok89]

The Dag Run column shows only run_after, so runs triggered at the same time can't be told apart. This adds a Dag Run ID column linking to the run, hidden by default and available from the column menu.

• Not shown on a Dag run's own Task Instances tab, where every row belongs to that run.
• Not sortable, as the task instances endpoint doesn't sort by run_id.

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Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)
  • Claude Code (Opus 5.5)

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