Fix native-style Qt warning; add a few tooltips; trim Namespace hint text

Root cause of "QFont::setPointSize: Point size <= 0 (-1)" on some
dropdowns: the app never sets an explicit widget style, so it defaults to
native windowsvista, whose popup code calls setPointSize() on fonts
resolved from our QSS's pixel-based font-size (pointSize() is -1 by
design for px fonts). Tried app.setStyle("Fusion") first — silences it,
but Fusion doesn't render buttons/dropdowns to match the QSS the way the
native style does. Kept native style, filtered just that one message via
qInstallMessageHandler instead — it's cosmetic Qt console noise (the
rejected setPointSize call is a no-op, doesn't affect rendering), not a
real bug.

Also adds a handful of tooltips (Control Editor's Check Syntax/Cancel/
Create Control, device Configure dialog's Close, main toolbar's View/
Configure/RUN/LOG/Settings, a few Control Panel widgets) from an
in-progress app-wide tooltip pass, paused partway through by request —
remaining buttons are being done manually.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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