feat(adjustments): add |type_slug template filter for badge class naming

core/templatetags/format_tags.py

@@ -27,6 +27,22 @@ def money(value):
     return formatted.replace(",", " ")
 
 
+# === type_slug filter ===
+# Converts adjustment-type labels like "Advance Payment" to
+# CSS-class-friendly slugs like "advance-payment". Used by the Adjustments
+# tab to pick the right colour badge class per row.
+@register.filter
+def type_slug(value):
+    """Return a hyphen-separated lowercase version of `value`.
+
+    Used in templates: `<span class="badge-type-{{ adj.type|type_slug }}">`.
+    Returns '' for None / empty — no class generated, no crash.
+    """
+    if not value:
+        return ''
+    return value.lower().replace(' ', '-')
+
+
 @register.filter
 def dictlookup(d, key):
     """Look up a dict value by a dynamic key.

core/tests.py

@@ -912,3 +912,28 @@ class InlineFiltersPairsContextTests(TestCase):
         project_ids = {p.id for p in resp.context['projects']}
         self.assertIn(out_project.id, project_ids,
             'URL-selected project must survive the date-scope filter')
+
+
+# =============================================================================
+# === TESTS FOR |type_slug FILTER ===
+# Used by Adjustments tab to build CSS class names from type labels.
+# =============================================================================
+
+
+class TypeSlugFilterTests(TestCase):
+    """format_tags.type_slug converts adjustment-type labels to slugs."""
+
+    def test_spaces_become_hyphens_and_lowercased(self):
+        from core.templatetags.format_tags import type_slug
+        self.assertEqual(type_slug('Advance Payment'), 'advance-payment')
+        self.assertEqual(type_slug('New Loan'), 'new-loan')
+        self.assertEqual(type_slug('Bonus'), 'bonus')
+
+    def test_empty_or_none_returns_empty_string(self):
+        from core.templatetags.format_tags import type_slug
+        self.assertEqual(type_slug(''), '')
+        self.assertEqual(type_slug(None), '')
+
+    def test_idempotent_on_already_slugged(self):
+        from core.templatetags.format_tags import type_slug
+        self.assertEqual(type_slug('bonus'), 'bonus')