Nested subtask titles truncate in the project task table — the indent eats the TASK column

[pat-lewczuk]

Follow-up from #972

#972 nests dispatched children under their parent in the project task table. The indent works, but it is taken out of the TASK column's width, so a child's title truncates much harder than a root's — in UI QA a child titled "QA child A — unit tests" rendered as QA chi…, while the very same row's Workflow column showed the title in full.

A parent that dispatched four children turns four rows into ellipses, which is the opposite of what the nesting is for. Cosmetic, not blocking — filed so it is not lost. (QA evidence, step 7 screenshot)

Acceptance criteria

• A nested child's title stays readable at the default column width — give the TASK column the indent's width back, let it flex, or show the full title on hover.
• Checked at two nesting depths and with the sidebar both expanded and collapsed.

Related: #972