bug: gain --deep dashboard layout

[malochapo]

lean-ctx version: 3.9.12

OS: WSL2

AI tool: irrelevant

What happened:

lean-ctx gain --deep has two dashboard layout regressions:

• RECENT DAYS rows repeat the literal cmds suffix on every row even though the column header already names commands.
• In the GAIN SCORE panel, a high trend sparkline can visually merge with the score bar because the score row and trend row are adjacent.

The dense terminal layout makes the recent-day rows noisier and can make the score bar/trend rows visually collide.

What you expected:

• RECENT DAYS should show the command count as a number under the Cmds column, without repeating cmds per row.
• The GAIN SCORE panel should keep one blank boxed row between the score bar and the trend: row.

Steps to reproduce:

Run:

lean-ctx gain --deep

Related PR: #1241