[SchrodingersCattt]

Part of #228.

After the horizontal scene-tab strip landed, a narrow sidebar could still crush tab labels and push Close others, Duplicate, and the rename row out of reach.

• The scene header and its action buttons wrap instead of overflowing.
• Each tab keeps a 4.5rem minimum width, a 220px maximum, and the existing horizontal scroller.
• The rename row wraps, and the label field no longer reserves a fixed 68% width that shoves Rename and Close off the row.

Scene-tab routing in the canvas script is unchanged.

  

[SchrodingersCattt]

Review (Part of #228)

Verdict: approve-ready (Camera WebGL still in progress at review time; other 8/9 green)

What it does

CSS densifies crowded scene tabs in a narrow sidebar so multi-structure sessions stay readable — medium #228 item, pure presentation.

CI

8/9 success; Camera WebGL still running. CSS-only change is unlikely to regress WebGL; re-check before merge if WebGL flips red.

Notes

• Good as a standalone PR; do not fold into #229.
• Merge after or beside #229; no logic conflict expected.
• No merge from me (author PR).