fix(dashboard): paginate CEO dashboard ticket fetch to respect API cap

The CEO dashboard requested /api/tickets?page_size=500, but the API caps
page_size at 200 (le=200 in app/routers/tickets.py), so the request
returned 422 and every KPI/chart rendered zeros.

- ceo.html: fetch all tickets by looping pages of page_size=200 until
  total items are collected (with a safety bound), keeping KPIs accurate
  as volume grows past 200.
- tests: add test suite anchoring the pagination contract — page_size=500
  returns 422, page_size=200 returns items/total/page/page_size, and a
  page loop collects every ticket without duplicates.
- pyproject: enable pytest-asyncio auto mode and tests/ discovery.
- .gitignore: un-ignore committed tests/test_*.py.

app/templates/dashboard/ceo.html

@@ -171,10 +171,22 @@
 
             async loadData() {
                 try {
-                    const allData = await app().apiGet('/api/tickets?page_size=500');
-                    if (!allData?.items) return;
-                    const all = allData.items;
-                    const total = allData.total || all.length;
+                    // Fetch ALL tickets via pagination. The API caps page_size at 200
+                    // (app/routers/tickets.py), so a single page_size=500 request returns 422
+                    // and the dashboard renders empty KPIs. Loop pages until we have `total`
+                    // tickets so KPIs stay accurate as volume grows past 200.
+                    const all = [];
+                    const pageSize = 200;
+                    let page = 1;
+                    let total = Infinity;
+                    while (all.length < total && page <= 1000) {  // 1000-page safety bound
+                        const allData = await app().apiGet(`/api/tickets?page=${page}&page_size=${pageSize}`);
+                        if (!allData?.items || !allData.items.length) break;
+                        all.push(...allData.items);
+                        total = allData.total ?? all.length;
+                        page += 1;
+                    }
+                    if (!all.length) return;
 
                     // Basic KPIs
                     const open = all.filter(t => !['Closed', 'Completed'].includes(t.status));