Hugh A Miles II 3602619e98 fix(dashboard): address Excel export review feedback ...

Addresses PR #41133 review comments:
- Blank/stringify non-finite and out-of-range Decimal cells instead of
  crashing xlsxwriter (shared _coerce_float_cell helper).
- Detect formula-injection prefixes behind leading whitespace via
  _quote_if_formula (lstrip before checking).
- Correct the module docstring to scope the constant-memory guarantee to
  the writer side (source rows may be materialized upstream).
- Append a "[Truncated: ...]" notice row when a sheet exceeds Excel's
  per-sheet row cap so dropped rows are visible.
- Note AWS S3's 7-day pre-signed URL cap on EXCEL_EXPORT_LINK_TTL_SECONDS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-01 12:22:41 -04:00

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