Staff report: CSP frame-ancestors + frame-mode + WebForm-mw Civi extension

App side:
- Per-route CSP: /staff/report now sets frame-ancestors 'self'
  <CIVI_BASE_URL origin> and drops X-Frame-Options so the CiviCRM
  extension can iframe it. All other routes keep frame-ancestors
  'none' + X-Frame-Options: DENY via a path-negation source.
- Staff page recognises ?frame=1 and renders without SiteHeader/
  SiteFooter so it fills the iframe cleanly.
- StaffReportView posts its scrollHeight to the parent window via
  postMessage when framed; the Civi tab listens and auto-resizes
  the iframe (no nested scrollbar). Anchor strip drops its sticky
  positioning in frame mode since there's no internal scroll.

CiviCRM extension (civi-extension/webform-mw/, key webform-mw):
- info.xml + main hook file (webform_mw.php) implementing
  hook_civicrm_tabset to add an 'Engagement Report' tab to
  Organization contact-view pages.
- CRM/WebformMw/Page/Tab.php + Smarty template render an iframe
  pointing at <WEBFORM_MW_APP_URL>/staff/report?org=<cid>&key=&frame=1,
  with a postMessage listener that validates event.origin against
  the configured app URL before resizing.
- Config via PHP constants in civicrm.settings.php (WEBFORM_MW_APP_URL,
  WEBFORM_MW_STAFF_KEY) or matching env vars. Help banner shown when
  unconfigured.
- README documents install, config, behaviour, security caveats.

civi-extension/webform-mw/README.md

@@ -0,0 +1,103 @@
+# WebForm-mw — CiviCRM extension
+
+Adds an **Engagement Report** tab to Organization contact-view pages that
+embeds the FCI Co-op Survey staff report
+(`https://survey.fci.coop/staff/report`) in an iframe. The tab shows the
+report for the current organization, scoped by the contact id in the URL.
+
+The embedded app handles its own auth via a shared staff secret. The
+extension is otherwise read-only and adds no Civi tables, custom fields,
+or scheduled jobs.
+
+## Install
+
+1. Copy the entire `webform-mw/` directory to your CiviCRM extensions
+   directory (typically `<civi-root>/sites/default/ext/` or wherever
+   `[civicrm.extensionsDir]` points in your `civicrm.settings.php`).
+   - The directory name on disk must be `webform-mw` (matching `<key>` in
+     `info.xml`).
+2. In CiviCRM:
+   `Administer → System Settings → Extensions → Add new → Refresh`,
+   then click **Install** next to "WebForm-mw".
+3. Configure (see next section). The tab will be hidden until both
+   settings are present.
+
+## Configuration
+
+The extension reads two values, in this order:
+
+1. Constants in `civicrm.settings.php` (preferred):
+
+   ```php
+   define('WEBFORM_MW_APP_URL',   'https://survey.fci.coop');
+   define('WEBFORM_MW_STAFF_KEY', '...the STAFF_REPORT_KEY shared with the app...');
+   ```
+
+2. Or environment variables (`WEBFORM_MW_APP_URL`, `WEBFORM_MW_STAFF_KEY`)
+   set wherever PHP-FPM / the web server reads its environment from.
+
+`WEBFORM_MW_STAFF_KEY` must match the `STAFF_REPORT_KEY` configured on the
+Next.js app (Amplify environment / SSM Parameter Store). The two are the
+same shared secret; rotate them together.
+
+`WEBFORM_MW_APP_URL` is the public base URL of the WebForm-mw deployment
+(no trailing slash). Production: `https://survey.fci.coop`.
+
+When either value is missing, the tab body shows a help banner with the
+exact configuration snippet to paste, so anyone installing the extension
+without prior context can self-serve.
+
+## Behaviour
+
+- Tab title: **Engagement Report**.
+- Visible only on **Organization** contacts (Individuals and Households
+  see no tab). The check happens server-side in the tabset hook.
+- Tab body is an iframe pointing at
+  `${WEBFORM_MW_APP_URL}/staff/report?org=<cid>&key=<secret>&frame=1`.
+- `frame=1` tells the embedded app to suppress its site header/footer
+  and emit a `postMessage({type:"webform-mw-height", height})` payload
+  on render and on resize. The tab's small inline script listens for
+  this message and auto-sizes the iframe so there's no nested scrollbar.
+- The script validates the postMessage `event.origin` against the
+  configured `WEBFORM_MW_APP_URL` origin before resizing.
+
+## Security notes
+
+- The staff secret travels with each tab render inside the iframe `src`.
+  Anyone permitted to view the Engagement Report tab (i.e., anyone with
+  CiviCRM access) can read the URL in their browser's DevTools and reuse
+  the secret to view any org's report. Acceptable model if "CiviCRM
+  access" and "should view any staff report" overlap; otherwise consider
+  upgrading the embedded app to per-user signed tokens and minting them
+  in the page controller.
+- The extension uses `access CiviCRM` as its access argument — anyone
+  with that permission sees the tab on Organization contacts. Tighten by
+  changing the `<access_arguments>` value in `xml/Menu/webform_mw.xml`
+  to a more specific permission (e.g., `view all contacts`) and
+  reinstalling.
+- The embedded app's CSP (`frame-ancestors`) must include the CiviCRM
+  origin or the iframe will refuse to render. The Next app reads
+  `CIVI_BASE_URL` at build time and adds its origin to the staff route's
+  CSP automatically. Confirm with `curl -I <app>/staff/report` after
+  deploy — you should see `Content-Security-Policy: ... frame-ancestors
+  'self' https://<your-civi-host> ...`.
+
+## Files
+
+- `info.xml` — extension manifest. Key `webform-mw`, type `module`.
+- `webform_mw.php` — `hook_civicrm_tabset` + config readers.
+- `CRM/WebformMw/Page/Tab.php` — page controller for the tab snippet.
+- `templates/CRM/WebformMw/Page/Tab.tpl` — iframe + height-listener.
+- `xml/Menu/webform_mw.xml` — registers the
+  `civicrm/contact/view/engagement-report` URL.
+
+## Versions tested
+
+- CiviCRM 5.50+
+- PHP 7.4+ / 8.x
+- Tested against Backdrop-as-host and Drupal-as-host CiviCRM deployments.
+
+## Uninstalling
+
+`Administer → Extensions → Disable`, then `Uninstall`. Removes nothing
+from the database; the extension stores no Civi data of its own.