chore: rename spreadsheet column header to "Wikitext preview" (!53) · Merge requests · Daanvr / upload-workbench

Summary

Rename the spreadsheet column whose cell is a click-to-open launcher for the read-only wikitext preview modal from "Wikitext" to "Wikitext preview", so the header makes clear that this is a preview (not the editable wikitext exposed by the publish modal).
Display label only — the underlying column key (wikitext) stays the same, so existing users' saved column preferences (visibility, order, width) on Preferences.json round-trip without churn.

npm run build clean (incl. undef-ref scanner)
Dev server confirms the table column header renders as "Wikitext preview"
On preview: open the workbench, scan the spreadsheet column headers, confirm the launcher column reads "Wikitext preview"
On preview: existing users with saved column preferences still see the column in the same position with the same width (only the visible label changed)

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