feat(05-02): printer detail page with export buttons and command preview

- Update printer_detail() to pass install_cmd, uninstall_cmd, has_driver, has_icon to template
- Rewrite printer_detail.html with Intune Commands, Export, and Icon sections
- Show command strings with Alpine.js copy-to-clipboard buttons (install-cmd, uninstall-cmd)
- Show NinjaRMM ZIP and .intunewin download links when driver assigned
- Add HTMX icon upload form with #icon-status swap target
- Remove disabled placeholder Regenerate Package button
- Add TestCommandPreview class (4 tests) to test_packages.py
- All 94 tests pass

tests/test_packages.py

@@ -144,3 +144,48 @@ class TestIntunewinDownload:
     def test_422_no_driver(self, client, printer_no_driver):
         resp = client.get(f"/printers/{printer_no_driver.id}/packages/intunewin")
         assert resp.status_code == 422
+
+
+# ---------------------------------------------------------------------------
+# Printer detail page — command preview and export links
+# ---------------------------------------------------------------------------
+
+
+class TestCommandPreview:
+    def test_detail_page_shows_commands(self, client, setup_printer_with_driver):
+        """Printer detail page shows install and uninstall command strings."""
+        printer, _ = setup_printer_with_driver
+        resp = client.get(f"/printers/{printer.id}")
+        assert resp.status_code == 200
+        html = resp.text
+        assert "install-cmd" in html
+        assert "uninstall-cmd" in html
+        assert "install.ps1" in html
+        assert "uninstall.ps1" in html
+
+    def test_detail_page_shows_export_links(self, client, setup_printer_with_driver):
+        """Printer detail page shows NinjaRMM ZIP and .intunewin download links."""
+        printer, _ = setup_printer_with_driver
+        resp = client.get(f"/printers/{printer.id}")
+        assert resp.status_code == 200
+        html = resp.text
+        assert f"/printers/{printer.id}/packages/ninja" in html
+        assert f"/printers/{printer.id}/packages/intunewin" in html
+
+    def test_detail_page_hides_commands_without_driver(self, client, printer_no_driver):
+        """Detail page hides command section and export links when no driver assigned."""
+        resp = client.get(f"/printers/{printer_no_driver.id}")
+        assert resp.status_code == 200
+        html = resp.text
+        assert "install-cmd" not in html
+        assert "packages/ninja" not in html
+        assert "packages/intunewin" not in html
+
+    def test_detail_page_shows_icon_upload_form(self, client, setup_printer_with_driver):
+        """Printer detail page always shows icon upload form."""
+        printer, _ = setup_printer_with_driver
+        resp = client.get(f"/printers/{printer.id}")
+        assert resp.status_code == 200
+        html = resp.text
+        assert f"/printers/{printer.id}/icon" in html
+        assert "icon-status" in html