View a policy version's content, and make policy text readable

The Policies admin page listed versions but never showed what any of them
said, so revising a policy meant retyping it blind into an empty draft box.
Each version row now has a View action that renders that version's text on
the page, editable in place. A draft is saved back to itself; editing a
published or archived version branches a new draft and leaves the original
alone, because acceptances are recorded against policy_version_id and text a
student agreed to must stay exactly as they saw it.

That viewer also exposed why a studio reported the acceptance box as
unreadable — one squashed line, overlapping words, a horizontal scrollbar.
Bodies are typed into a bare textarea, so most carry no markup, and the raw
text was emitted with its blank lines intact but nothing to turn them into
paragraphs. PolicyVersion::bodyHtml() now renders every body the way
WordPress renders post content (kses, then wpautop) and feeds all three
consumers: the booking/enrolment JSON, the signup form, and the new viewer.
Bodies written with markup are unaffected.

The other half was that .us-policy-body had no CSS whatsoever and inherited
whatever the theme did with an unstyled block in a form. It is now a bounded
reading box that scrolls vertically and breaks long tokens, so a pasted URL
cannot force the page sideways and a long policy cannot push the accept
checkbox out of view. RegistrationPage was also never enqueueing the plugin
stylesheet, which is why the signup gate looked worst of all.

Closes #126
Closes #127

Co-Authored-By: Claude Opus 5 <[email protected]>

tests/Unit/Policy/PolicyEndpointTest.php

@@ -9,12 +9,14 @@ use Unsupervised\Schedular\Policy\Policy;
 use Unsupervised\Schedular\Policy\PolicyEndpoint;
 use Unsupervised\Schedular\Policy\PolicyRepository;
 use Unsupervised\Schedular\Policy\PolicyService;
+use Unsupervised\Schedular\Policy\PolicyVersion;
 use Unsupervised\Schedular\Policy\PolicyVersionRepository;
 use Unsupervised\Schedular\Tests\Unit\TestCase;
 
 class PolicyEndpointTest extends TestCase
 {
     private PolicyRepository&Mockery\MockInterface $policies;
+    private PolicyVersionRepository&Mockery\MockInterface $versions;
     private PolicyService&Mockery\MockInterface $service;
     private PolicyEndpoint $endpoint;
 
@@ -24,16 +26,43 @@ class PolicyEndpointTest extends TestCase
 
         Functions\when('sanitize_text_field')->returnArg();
         Functions\when('sanitize_title')->returnArg();
+        Functions\when('wp_kses_post')->returnArg();
+        $this->stubAutop();
 
         $this->policies = Mockery::mock(PolicyRepository::class);
+        $this->versions = Mockery::mock(PolicyVersionRepository::class);
         $this->service  = Mockery::mock(PolicyService::class);
         $this->endpoint = new PolicyEndpoint(
             $this->policies,
-            Mockery::mock(PolicyVersionRepository::class),
+            $this->versions,
             $this->service,
         );
     }
 
+    public function testIndexReturnsPlainTextBodiesAsParagraphs(): void
+    {
+        $policy  = new Policy('Cancellation', 'cancellation', currentVersionId: 7, id: 4);
+        $version = new PolicyVersion(
+            policyId: 4,
+            versionNumber: 2,
+            body: "Give 24 hours notice.\n\nLate cancellations are billed in full.",
+            status: PolicyVersion::STATUS_PUBLISHED,
+            id: 7,
+        );
+
+        $this->policies->shouldReceive('findAll')->andReturn([$policy]);
+        $this->versions->shouldReceive('findById')->with(7)->andReturn($version);
+
+        $body = $this->endpoint->index(new \WP_REST_Request([]))->get_data();
+
+        // The admin typed no markup, so the gate still receives real paragraphs
+        // rather than one unbroken run of text.
+        self::assertSame(
+            '<p>Give 24 hours notice.</p><p>Late cancellations are billed in full.</p>',
+            $body[0]['body']
+        );
+    }
+
     public function testCreateRejectsTitleLongerThanColumnLimit(): void
     {
         $this->service->shouldNotReceive('createPolicy');