Stamp 2.60.0 incomplete PCB exam and owner project delete.

Partial layouts still use MODE=pcb. Missing copper is INSUFFICIENT or
skipped, never Euclidean stand-in tracks. Via≠Pad unchanged. DELETE
/api/projects/{id} is owner-only with a dashboard confirm dialog.

tests/test_periscope_project_delete_ui.py

@@ -0,0 +1,65 @@
+"""Dashboard owner delete uses a confirm dialog, not window.confirm."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+BTN = (
+    ROOT
+    / "periscope"
+    / "src"
+    / "frontend"
+    / "src"
+    / "components"
+    / "dashboard"
+    / "delete-project-button.tsx"
+)
+CARD = (
+    ROOT
+    / "periscope"
+    / "src"
+    / "frontend"
+    / "src"
+    / "components"
+    / "dashboard"
+    / "project-card.tsx"
+)
+TABLE = (
+    ROOT
+    / "periscope"
+    / "src"
+    / "frontend"
+    / "src"
+    / "components"
+    / "dashboard"
+    / "projects-table.tsx"
+)
+API = ROOT / "periscope" / "src" / "frontend" / "src" / "lib" / "api.ts"
+
+
+def test_delete_dialog_is_src_and_owner_only_copy():
+    text = BTN.read_text(encoding="utf-8")
+    assert "Native Periscope overlay" not in text[:400]
+    assert "export function DeleteProjectButton" in text
+    assert "AlertDialog" in text
+    assert "deleteProject" in text
+    assert "window.confirm" not in text
+    assert "confirm(`" not in text
+
+
+def test_dashboard_cards_and_table_use_delete_dialog():
+    card = CARD.read_text(encoding="utf-8")
+    table = TABLE.read_text(encoding="utf-8")
+    assert "DeleteProjectButton" in card
+    assert "DeleteProjectButton" in table
+    assert "confirm(" not in card
+    assert "confirm(" not in table
+    assert "!foreign" in card
+    assert "!foreign" in table
+
+
+def test_api_delete_is_http_delete():
+    text = API.read_text(encoding="utf-8")
+    assert "export async function deleteProject" in text
+    assert 'method: "DELETE"' in text