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feat(preview): render XLSX spreadsheets in the file-preview overlay

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xlsx files were download-only. Add a read-only, virtualized preview (sheet
tabs, number formats, merges, theme colours) parsed entirely in a browser
Web Worker with exceljs and fflate, loaded only when a spreadsheet is
opened. The workbook is checked against ZIP-bomb, entry and cell limits
before exceljs loads; cell text is written with textContent, formulas are
never evaluated and nothing referenced by the workbook is fetched. On the
server xlsx only joins the existing allowlist and classification, with a
10 MB cap on ?preview=true. xls and ods stay download-only.
This commit is contained in:
Aamer Akhter
2026-09-26 23:13:21 -04:00
parent 45ea2e1d32
commit 0b122e2c76
27 changed files with 3765 additions and 13 deletions
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src/web/public/mobile.css
+21
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@@ -3937,3 +3937,24 @@ html[data-session-list="sidebar"] .session-sidebar .session-tab .tab-close {
max-height: min(88vh, env(viewport-segment-height 0 1, 88vh));
}
}
/* XLSX preview (spreadsheet-preview.js): larger sheet tabs and a taller,
touch-scrollable grid on phones. */
@media (max-width: 700px) {
.spreadsheet-sheet-tabs {
padding-inline: 4px;
scroll-snap-type: x proximity;
}
.spreadsheet-sheet-tab {
min-width: 96px;
min-height: 40px;
scroll-snap-align: start;
}
.spreadsheet-grid {
min-height: 55vh;
-webkit-overflow-scrolling: touch;
touch-action: pan-x pan-y;
}
}