Regression: Plan tab reading-column cap is back (fixed in v1.1.12 via #2888, broken again in v1.1.22)

Start at the workspace Plan tab's rendered markdown view and compare its behavior with the #2888 fix from v1.1.12. Reproduce with the provided column ruler while widening or maximizing the panel. Done means rendered text uses the available width and a regression test covers the reflow behavior.

Summary

This is a regression of #2888 (fixed in v1.1.12). The Plan tab's rendered markdown view again caps prose to a fixed reading column (~95-100 characters) instead of using the available panel width. Reproduced on v1.1.22.

The original bug (#2888) was closed as fixed in v1.1.12; the reflow behavior has since regressed. This is distinct from the chat/conversation-view width issues (#3195, #3795) - it is specifically the workspace Plan tab.

What happens

Widening the panel or the whole window - including Maximize Panel - does not reflow the rendered text; it stays in the same narrow column with dead space on the right. The <> code view of the same plan has no such cap and runs edge-to-edge.

Steps to reproduce

1. Open a session so the Plan tab is visible (close and re-open the tab to force a fresh render).
2. Use a plan whose body contains this column ruler (each label sits at its true character column):

--------10--------20--------30--------40--------50--------60--------70--------80--------90-------100-------110-------120-------130-------140-------150-------160

3. View the rendered Plan tab, then widen the panel / click Maximize Panel.

Expected

The rendered text reflows to use the available panel width, as it did after the #2888 fix in v1.1.12.

Actual

Text wraps at ~column 96 regardless of panel or window width - the ruler breaks right after the 90 label even in a maximized panel. The <> code view is unaffected (full width).

Environment

• App version: 1.1.22 (regressed; last known good: v1.1.12)
• OS: Windows
• Surface: workspace Plan tab (rendered markdown view)

Related

• #2888 - original report, fixed in v1.1.12, now regressed (this issue)
• #2608 - same class of reflow bug in the MD Editor, fixed in v1.1.6
• #3195, #3795 - chat/conversation-view horizontal-space issues (different surface)

Suggested fix

Restore the #2888 reflow fix for the Plan tab's rendered view, and consider a regression test so this surface's reflow doesn't break again. A width preference (e.g. 120 / 140 / full-width) for rendered markdown surfaces would also help.