The "Full Table Search" section said only that a search box exists. It now
states the behaviour that users actually hit:
- the search covers every column at once, character columns by case sensitive
CONTAINS and numeric columns by exact match
- the Numeric toggle switches to exact numeric matching
- an applied filter scopes the search
- results are capped by DC_MAXOBS_WEBVIEW (linked to the options page), and the
row count next to the table name reports the match count
- a search with no matches shows the "No data found with given conditions"
panel
Adds a screenshot of the search in action (docs/img/full-table-search.png),
captured from a running instance via the Cypress suite in the dc repo.
