[WebTigers]

Found during a UI functional-testing pass. Nothing in the suite renders a page, so none of these four showed up as a failing test.

The chain

#	Defect	Where
1	Missing useDataTables → layout emits no jQuery/DataTables/tiger.datatable.js	Comment_AdminController, Newsletter_AdminController, System_SitesController
2	Wrong service key — method: where the helper reads action: → the /api message names no action	comment.admin.js, newsletter.admin.js
3	_dtParams() called with no arguments against array $params → TypeError on every request	Comment_Service_Comment::datatable()
4	DataTables' default errMode is alert() → a blocking native dialog, and the failure never reaches the console	tiger.datatable.js

Each fix exposed the next. Loading the library revealed the wrong key; fixing the key revealed the TypeError; seeing the TypeError at all required replacing the alert with a console error first.

#1 is the nastiest shape we ship: 200, empty table, zero console errors — because the screen's own guard (if (!window.tigerDataTable) { return; }) is doing exactly what it was written to do. Our cheapest browser detector is "no console errors," and it is blind to this.

Counts for scale: 12 controllers set the flag correctly, 13 grids pass action, 15 services pass $params. These three screens were the gap in each.

Fixes

• One line in each of the three controller actions.
• method: → action: in the two grid scripts.
• _dtParams($params) in the comment service.
• tiger.datatable.js: errMode = 'throw' (never a dialog), plus an explicit guard that refuses a grid missing {module, service, action} and logs the cause at the call site — so the next occurrence of Add Module: tab the UI (Browse / URL / Upload) + zip upload install #2 is caught by a developer and by the browser probe, with no modal.

Verified in a real browser on dev

All three screens: headers, search, sort and pagination render, the /api call succeeds, the empty state is the grid's own (No data available), console clean.

The errMode + guard change was mutation-checked in-page — re-passing the old shape returns null and logs use `action`, not `method` with no dialog:

{ errMode: "throw",
  returned: null,
  consoleError: "tigerDataTable(#tiger-guard-probe): service needs { module, service, action } — got {\"module\":\"newsletter\",\"service\":\"subscribe\",\"method\":\"datatable\"} (use `action`, not `method`)" }

Comments were switched on for the check and switched back off — off by default is deliberate.

Suites: 1200 unit / 18318 assertions and 1554 integration / 5217 assertions, both green.

Also

tests/ui/README.md now states the harness's scope as decided: scenarios run on demand — no CI job, no promoted-spec directory, no Playwright suite to maintain. A finding becomes a Jira ticket; a statically detectable class of finding belongs in paradigm-scan.php. The empty regression/ directory is gone.

🤖 Generated with Claude Code

https://claude.ai/code/session_013vdyTeoDrGE4hKxt53TsE8