fix: pin black to 26.3.1 across all environments

- Pin black version in requirements-dev.txt (was >=24.0.0)
- Update pre-commit to use black 26.3.1 with Python 3.12
- Add language_version: python3.12 to pre-commit black hook
- Reformat files with new black version for consistency

app/components/strategy_panel.py

@@ -117,8 +117,7 @@ class StrategyComparisonPanel:
             scenario_class = (
                 "text-emerald-600 dark:text-emerald-400" if scenario >= 0 else "text-rose-600 dark:text-rose-400"
             )
-            rows.append(
-                f"""
+            rows.append(f"""
                 <tr class=\"border-b border-slate-200 dark:border-slate-800\">
                     <td class=\"px-4 py-3 font-medium text-slate-900 dark:text-slate-100\">{name}</td>
                     <td class=\"px-4 py-3 text-slate-600 dark:text-slate-300\">${cost:,.2f}</td>
@@ -126,8 +125,7 @@ class StrategyComparisonPanel:
                     <td class=\"px-4 py-3 text-slate-600 dark:text-slate-300\">{self._format_cap(strategy)}</td>
                     <td class=\"px-4 py-3 font-semibold {scenario_class}\">${scenario:,.2f}</td>
                 </tr>
-                """
-            )
+                """)
         return f"""
         <div class=\"overflow-x-auto\">
             <table class=\"min-w-full rounded-xl overflow-hidden\">