Remove [Platform("Win")] from TestVBAMacroReader; fix AutoSizeColumn on Linux

[Copilot]

TestVBAMacroReader was gated to Windows-only and AutoSizeColumn/AutoSizeRow failed on Linux due to font rendering errors and three correctness bugs. This PR makes both work cross-platform.

AutoSizeColumn correctness bugs (XSSFSheet)

Three independent bugs prevented correct column sizing in existing workbooks:

• CT_Cols.BreakUpCtCol off-by-one: lastColumn is 0-based, ctCol.min/ctCol.max are 1-based — fix: use lastColumn + 1
• AutoSizeColumnTracker.SetMaxColumnWidths self-reference: withSkipMergedCells was compared against withUseMergedCells instead of itself, so unmerged width was never tracked independently
• XSSFSheet.AutoSizeColumn wrong column updated: SetColBestFit() inserted a new <col> element instead of updating the one just resized — replaced with GetColumn(column)?.IsBestFit = true

AutoSizeColumn on Linux (SheetUtil.cs)

All TextMeasurer calls now catch FontException | InvalidFontFileException (thrown on Linux when font tables are missing) with graceful fallbacks:

• Width: estimated as charCount × (fontHeightPx × 0.5) — preserves relative differences across fonts/rotations
• Height: size × dpi / 72
• Default char width: returns 7 (≈ pixel width of '0' in Calibri 11pt @ 96 DPI)

VBAMacroReader cross-platform (TestVBAMacroReader.cs)

SimpleMacro.vba test files have Unix \n endings but VBAMacroReader returns CRLF from Office binaries — Contains comparisons always failed on Linux. Fixed by normalizing before comparison:

// Normalize \n → \r\n to match what VBAMacroReader extracts from Office files
string testMacroContents = Regex.Replace(Encoding.UTF8.GetString(bytes), @"\r?\n", "\r\n");

Also changed FileAccess.ReadWrite → FileAccess.Read (file is only read), and removed the [Platform("Win")] class attribute.

EscherGraphics font fallback

GetFontFamilyOrFallback now iterates system fonts and skips any that throw InvalidFontFileException (e.g. the APT-installed NotoColorEmoji.ttf which lacks the required loca table), rather than crashing on SystemFonts.Families.First().

Original prompt

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This section details on the original issue you should resolve

<issue_title>AutoSizeColumn only resizes the second column</issue_title>
<issue_description>### NPOI Version
2.7.5

File Type

• XLSX
• XLS
• DOCX
• XLSM
• OTHER

Upload the Excel File

Doesn't matter

Reproduce Steps

1. Open a workbook using .NET Framework 4.8 and NPOI version 2.7.5.
2. Call void AutoSizeColumn(int column) on all columns.
3. Save workbook using void Write(Stream stream, bool leaveOpen = false);
4. Open Excel file

Issue Description

Only the second column is resized; all other columns in all tested files remain unchanged.

</issue_description>

Comments on the Issue (you are @copilot in this section)

@tonyqus Can you upload the Excel file to help reproduce the issue?

• Fixes AutoSizeColumn only resizes the second column #1663

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