Real Zoho time-log exports carry ~120 columns; we only consume ~20. The
parser was reporting every unused header (Project Billing Client, Task
Stage, Project Owner Email, … ~90 of them) under "Unrecognised columns",
which surfaced a multi-line warning banner on every upload even though
nothing was wrong.
New semantics — `unrecognised_columns` now lists only REQUIRED canonical
fields we COULDN'T locate (date / submitter / hoursLogged). Empty list
on every clean export. Surfaces the actual signal: "Zoho renamed
something you depend on" — buried before, prominent now.
- zoho_parse.py: extras silently ignored; only missing requireds reported.
- UploadButton banner copy: "Couldn't find expected columns: …" with a
hint that charts will be incomplete.
- Tests updated: extras don't trigger, missing requireds do.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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