fix: HTML attribute quoting in hx-confirm, test assertion precision (A11-T1)

Critical quoting fix: the hx-confirm attribute now uses U+201D (") for the
closing German quote instead of ASCII " (0x22), which was terminating the
attribute early and losing the confirm message text. The template now
correctly contains: hx-confirm="Szenario „{{ sc.name }}" mit allen..."

Test enhancement: restored the complete assertion text from the brief and
added HTML parsing verification to ensure the attribute value matches exactly
with correct typographic quotes.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

finance/app/templates/szenarien.html

@@ -14,7 +14,7 @@
       · Einmalposten: {{ 'ja' if sc.include_planned else 'nein' }}
       <button type="button" onclick="toggleEdit('sc', {{ sc.id }}, true)">Bearbeiten</button>
       <button type="button" hx-delete="/api/scenarios/{{ sc.id }}" hx-swap="none"
-              hx-confirm="Szenario „{{ sc.name }}" mit allen Einträgen wirklich löschen?"
+              hx-confirm="Szenario „{{ sc.name }}” mit allen Einträgen wirklich löschen?"
               hx-on::after-request="if(event.detail.successful){window.location.reload()}">Löschen</button>
     </p>
     <div id="sc-edit-{{ sc.id }}" hidden>

finance/tests/test_gui.py

@@ -486,14 +486,41 @@ def test_grafana_links_fallback_to_host_port_when_unset(client, monkeypatch):
 
 
 def test_szenarien_seite_hat_loeschen_button(client, db):
+    from html.parser import HTMLParser
+
     client.post("/login", data={"username": "admin", "password": "geheim"})
     sc = Scenario(name="Wegwerf", description="", include_recurring=True,
                   include_planned=True)
     db.add(sc)
     db.commit()
     r = client.get("/szenarien")
+
+    # Verify delete button is present
     assert f'hx-delete="/api/scenarios/{sc.id}"' in r.text
-    assert 'Szenario „Wegwerf" mit allen Einträgen wirklich löschen?' in r.text
+    # Verify the full confirmation text in the page (brief requirement)
+    assert 'Szenario „Wegwerf” mit allen Einträgen wirklich löschen?' in r.text
+
+    # Parse HTML to verify the hx-confirm attribute has correct value with proper quotes
+    class ButtonParser(HTMLParser):
+        def __init__(self):
+            super().__init__()
+            self.hx_confirm_value = None
+            self.found_delete_button = False
+
+        def handle_starttag(self, tag, attrs):
+            if tag == "button":
+                attrs_dict = dict(attrs)
+                if attrs_dict.get("hx-delete") == f"/api/scenarios/{sc.id}":
+                    self.found_delete_button = True
+                    self.hx_confirm_value = attrs_dict.get("hx-confirm")
+
+    parser = ButtonParser()
+    parser.feed(r.text)
+    assert parser.found_delete_button, "Delete button not found"
+    # Verify the attribute value uses correct typographic quotes
+    expected_confirm = 'Szenario „Wegwerf” mit allen Einträgen wirklich löschen?'
+    assert parser.hx_confirm_value == expected_confirm, \
+        f"hx-confirm attribute mismatch: got {repr(parser.hx_confirm_value)}, expected {repr(expected_confirm)}"
 
 
 def test_szenario_loeschen_roundtrip_gui(client, db):