Copy the statistics table and graph to the clipboard

Copy All takes whichever tab is open, as N1MM's does: the table off the table
tab, a picture of the graph off the graph tab. Copy Table as Text and Copy
Graph as Image do either one from either tab.

`StatisticsTable` lays the pivot out as the window prints it — the headings,
the rows, the Total line — and pads it into columns for the text form, so the
grid, the clipboard and Print to File all say the same thing.

X11 asks for a picture when the other program pastes rather than when it is
copied, so the bitmap given to the clipboard is held until the clipboard is
given a different one. Disposing it at the end of the copy killed the program
on the next paste; the table pasted into a second Avalonia program reads back
lined up, and the picture reads back as a 916x438 bitmap.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PdAYHcdRktqKry7nk414TU

docs/unfinished.md

@@ -668,12 +668,17 @@ What still differs, and why:
 the log under any two of its fields, in N1MM's own two lists — 29 fields down
 the rows, 20 of them across the columns — with N1MM's `Tot` and `Accum` columns,
 its `Total` line, its "Include Dupes & X-QSOs" box and its stacked column graph.
-Left out: printing to a printer, which needs a print dialog this program has
-nowhere else, and N1MM's font size spinner, because the theme dialog sets the
-fonts here. Copy All copies the table as text on both tabs; N1MM copies the
-graph as an image on the graph tab, which the clipboard on Linux would need a
-per-toolkit path for, so the graph is written to a PNG through File ▸ Save Graph
-instead.
+Copy All takes whichever tab is open, as N1MM's does: the table as spaced text
+off the table tab, a picture of the graph off the graph tab. File ▸ Copy Table
+as Text and File ▸ Copy Graph as Image do either from either tab, and File ▸
+Save Graph writes the picture to a PNG. Left out: printing to a printer, which
+needs a print dialog this program has nowhere else, and N1MM's font size
+spinner, because the theme dialog sets the fonts here.
+
+X11 hands over a picture only when the other program pastes, not when it is
+copied, so `StatisticsWindow` holds the bitmap it gave the clipboard until it
+gives it a different one. Disposing it at the end of the copy killed the
+program on the next paste.
 
 The palette names are N1MM's twelve, which are the .NET chart control's. The
 colours are not: they are chosen to match the name, because the control's own