SQLBI Whiteboard 1.1.5

Say at startup when there is no pen or touchscreen (#80)

SQLBI Whiteboard is built for a pen or a finger. On a computer with
neither there
is nothing to draw with, which is worth saying rather than leaving
someone to
work out why the pen tools do nothing.

`NoDigitizerWindow` appears at startup when Windows reports neither a
pen tablet
nor a touchscreen. It reads the same `Tablet.TabletDevices` list the
Finger
drawing setting already uses, so the two agree about what counts as a
pen. The
notice says what is missing, that a mouse pans, zooms and moves
containers but
cannot draw, and links to
[discussion
78](https://github.com/sql-bi/SQLBI-Whiteboard/discussions/78) for
anyone who wants to vote for mouse-only drawing. The application opens
either
way — refusing to start would be worse than saying what is absent.

## Dismissable, for two reasons

That tablet list is a list of digitizers rather than an answer about
what is
plugged in right now, so a pen that has never been brought into range
can be
missing from it. A false positive is therefore possible, and on a
genuinely
mouse-only machine the notice would otherwise appear at every launch.

So it carries its own **Do not show this again**, which writes
`AppSettings.WarnWhenNoDigitizer` and saves immediately, and the same
switch is a
**Startup** row in Preferences so it can be turned back on. Settings
version 11 →
12; covered by smoke tests for the default and for the round trip.

README, the guide's list of what Preferences holds, and the site FAQ
answer for
"do I need a pen?" are updated to match.

Version 1.1.5. Release build clean with `TreatWarningsAsErrors`, smoke
tests pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>