Control-bar step labels now show the standard debugger qualifier after
the key mnemonic, styled italic:
(s)tep over (was (s)tep)
(d)escend into (was (d)escend)
(r)eturn out (was (r)eturn)
The qualifier is rendered with a new `TurboDebugBarItalic` highlight
(Comment fg + italic). When the cbar can't fit all controls with
qualifiers, `build_controls(true)` is retried as `build_controls(false)`
and the qualifiers are dropped — the compact labels survive.
Also overrides the global `WinSeparator` highlight to the bright
TurboDebugBarSeparator color during debug mode, so every split divider
in the editor — between dapui panes, between source and console,
between our bars and their neighbors — renders one consistent chrome
color. Original WinSeparator captured on first apply, restored byte-
for-byte on M.exit.
swaits
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