[iamgp]

Why the change

Worksheet forms title each section with a merged band such as "Supplementary Pages" or "Equipment", and the scan read those bands as data: as a table header over the section, or as the label of a list field over the section's own row labels.

Special things to note

• The band rule only fires when a run is exactly one merged region, so a merged cell inside a real header row (a two-column group name) still reads as a column name.
• This is a follow-up to fix(editor): separate plate grids from their metadata and retire covered suggestions #11 and does not change the plate-grid behaviour there.

Change outline

Two guards, both keyed on the same shape: a run of cells that is one merged region is a title, not data.

 findTableSuggestions
   assessHeaderRow
+  if (isSectionBand(row, run)) continue          # a band titles the section, it does not name columns
   measureTableBlock

 findRangeSuggestions
   label = sheet.data[row][col]
+  if (label cell is merged across columns) continue   # a band never starts a list field
   depthAt(...)

isSectionBand(row, startCol, endCol)
  for every column in the run
    if the cell is not merged, or its merge is not exactly startCol..endCol
      return false
  return true

The section band that used to be read as a header row, in the reported shape:

 row 28  [ Blank and NPC preparation            ]   merged A28:F28
 row 29    PBS aliquoted for Blank and NPC ...   Yes
-        -> table "blank_and_npc_preparation_table" over A28:F, headers [Blank and NPC preparation x6]
+        -> no suggestion

 editor/src/
 └── lib/
     ├── suggestions.ts          # isSectionBand guard in the table and range paths
     └── suggestions.test.ts     # 2 new cases: band as header, band as list label