mecatui: audit missed dynamic card-row width paths

Problem

Several dynamic mecatui card paths remain structurally outside the card-layout correction and may overflow at narrow widths or long server-derived values:

• MCP status/error rows
• User Model metadata labels plus wrapped values
• Dream field labels plus wrapped values
• Reflection trigger rows

Follow-up

For each path, first add a concrete narrow-width regression that demonstrates the failure. Where confirmed, derive the effective body width, reserve any label/prefix width, sanitize and trim display-only trailing whitespace, wrap raw content before styling, and retain source content/intentional whitespace. Do not apply a broad mechanical migration or alter normal-width rendering without a reproducing test.

Context

Identified during PR #1105 panel review. This is deliberately separate from the reviewed tool/delegation card corrections.