feat: patch umya-spreadsheet to fix 12 of 15 XLSX panics

[developer0hye]

Summary

• Fork and patch umya-spreadsheet (v2.3.3) to replace 15+ panic-causing unwrap() calls and panic!() macros with graceful error handling
• Integrate the patched fork via [patch.crates-io] in workspace Cargo.toml
• Add comprehensive tests verifying all 22 previously-problematic XLSX files

Changes

umya-spreadsheet fork (fix/panic-safety-v2)

Fixes applied to 11 files in the fork:

Category	Files Fixed	Change
FileNotFound (7 panics)	raw_file.rs	Skip missing zip entries instead of unwrap()
dataBar EOF (2 panics)	data_bar.rs, icon_set.rs	return on EOF instead of panic!()
iconSet bug	icon_set.rs	Fix copy-paste: looked for "dataBar" end element instead of "iconSet"
ParseIntError overflow (2 panics)	u_int32_value.rs, int32_value.rs	try_from with fallback for out-of-range values
ParseFloatError (1 panic)	number_format.rs, number_formater.rs, percentage_formater.rs	unwrap_or defaults for numeric parsing
unwrap on None (3 panics)	stylesheet.rs, cell.rs, conditional_formatting_rule.rs	if let/unwrap_or_default for missing styles/elements

office2pdf integration

• Cargo.toml: Add [patch.crates-io] pointing to fork's fix/panic-safety-v2 branch
• Updated and added tests for all 22 files from issue upstream: umya-spreadsheet panics and parse failures on valid XLSX files #83

Results

Category	Before	After	Improvement
Panicking files	15	3	12 files fixed (80%)
Successfully converting	0 of 15	12 of 15	+12 files
Clean error (no crash)	0 of 15	3 of 15	Remaining panics caught by catch_unwind
Parse error files	7	7	Unchanged (zip-level errors)

Files now converting successfully (12)

• chart_hyperlink.xlsx, hyperlink.xlsx, tdf130959.xlsx, test_115192.xlsx
• 47504.xlsx, bug63189.xlsx, ConditionalFormattingSamples.xlsx
• check-boolean.xlsx, tdf100709.xlsx, sample-beta.xlsx
• tdf162948.xlsx, NewStyleConditionalFormattings.xlsx

Files still failing with clean errors (3)

• functions-excel-2010.xlsx — arithmetic overflow in formula parsing
• FormulaEvalTestData_Copy.xlsx — arithmetic overflow in formula parsing
• 64450.xlsx — unwrap() on None in a different code path

Test plan

• Fork's own test suite passes (88 tests)
• cargo test --workspace passes
• cargo fmt --all -- --check passes
• cargo clippy --workspace -- -D warnings passes
• All 12 newly-fixed files produce valid PDFs
• Remaining 3 panic files return clean Err (no process crash)
• All 7 parse-error files still return appropriate errors

Related: #83

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