feat(KAN-34): rework blocker and ticket history

tests/Fixtures/ticket-detail-browser.mjs

@@ -101,6 +101,63 @@ try {
     }
     await page.setViewportSize({ width: 390, height: 1000 });
     await visit();
+    const blocker = content().locator('#ticket-blocker');
+    const blockerToggle = blocker.getByRole('checkbox', {
+        name: 'Mark ticket as blocked',
+        exact: true,
+    });
+    const blockerComment = blocker.getByLabel('Blocker comment', {
+        exact: true,
+    });
+    assert.equal(await blockerToggle.isChecked(), true);
+    assert.equal(
+        await blocker.getByText('Alex Morgan', { exact: true }).count(),
+        0,
+    );
+    assert.equal(
+        await content()
+            .locator('#ticket-history')
+            .getByText('Alex Morgan', { exact: true })
+            .count(),
+        1,
+    );
+    assert.equal(
+        await content()
+            .locator('#ticket-history')
+            .getByText('Status changed', { exact: true })
+            .count(),
+        1,
+    );
+    await blockerComment.fill('');
+    assert.equal(
+        await blockerComment.evaluate(
+            (element) => element.validity.valueMissing,
+        ),
+        true,
+    );
+    await blockerComment.fill('Waiting for a production decision.');
+    await blocker.getByRole('button', { name: 'Save blocker' }).click();
+    await page.getByText('Ticket updated.', { exact: true }).waitFor();
+    assert.equal(
+        await blockerComment.inputValue(),
+        'Waiting for a production decision.',
+    );
+    assert.equal(
+        await content()
+            .locator('#ticket-metadata')
+            .getByText('Alex Morgan', { exact: true })
+            .count(),
+        2,
+    );
+    await blockerToggle.uncheck();
+    await blocker.getByRole('button', { name: 'Unblock ticket' }).click();
+    await blocker
+        .getByText('This ticket currently has no active blocker.', {
+            exact: true,
+        })
+        .waitFor();
+    assert.equal(await blocker.getByLabel('Blocker comment').count(), 0);
+    await visit();
     await tabTo(edit());
     await page.keyboard.press('Enter');
     await page.getByLabel('Title', { exact: true }).fill('Unsaved title draft');

tests/Fixtures/ticket-detail.mjs

@@ -108,9 +108,18 @@ const ticket = {
         },
     ],
     worklog_entries: [
+        {
+            id: 2,
+            actor: null,
+            actor_id: null,
+            entry_type: 'status_changed',
+            summary: 'Moved from Backlog to Delivery / In progress.',
+            created_at: '2026-09-11T13:00:00Z',
+        },
         {
             id: 1,
             actor: user,
+            actor_id: user.id,
             entry_type: 'created',
             summary: 'Ticket created in the project backlog.',
             created_at: '2026-09-11T12:00:00Z',
@@ -361,7 +370,19 @@ if (serve) {
                 if (params.has('reject')) {
                     params.set('rejected', '1');
                 } else {
-                    savedForm = data;
+                    savedForm = {
+                        ...data,
+                        blocked_comment: data.is_blocked
+                            ? data.blocked_comment
+                            : null,
+                        field_values: data.field_values.map((fieldValue) => ({
+                            ...fieldValue,
+                            user_value:
+                                Number(fieldValue.value_user_id) === user.id
+                                    ? user
+                                    : null,
+                        })),
+                    };
                     params.set('saved', data.title);
                 }
             }
@@ -442,6 +463,9 @@ if (serve) {
             'feature/ENG-42-cache',
             'Cache implementation',
             'Ticket created in the project backlog.',
+            'Ticket created',
+            'Status changed',
+            'System',
         ]) {
             assert.ok(
                 html.includes(text),
@@ -452,6 +476,7 @@ if (serve) {
             'description',
             'checklist',
             'metadata',
+            'blocker',
             'relationships',
             'history',
             'git',