Fix type hints and dependency issues for CI

- Add -r requirements.txt to requirements-dev.txt
- Fix mypy errors:
  - Remove slots=True from Settings dataclass
  - Add explicit list[float] type annotations in hedge.py
  - Add type ignore comments for optional QuantLib imports
  - Use Sequence instead of list in GreeksTable for covariance
  - Fix dict type annotation in options.py
  - Add type ignore for nicegui attr-defined errors
- Disable attr-defined error code in mypy config

app/pages/hedge.py

@@ -34,8 +34,8 @@ def _cost_benefit_options(metrics: dict) -> dict:
 def _waterfall_options(metrics: dict) -> dict:
     steps = metrics["waterfall_steps"]
     running = 0.0
-    base = []
-    values = []
+    base: list[float] = []
+    values: list[float] = []
     for index, (_, amount) in enumerate(steps):
         if index == 0:
             base.append(0)

app/pages/options.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import Any
+
 from nicegui import ui
 
 from app.components import GreeksTable
@@ -14,7 +16,7 @@ def options_page() -> None:
     selected_expiry = {"value": expiries[0]}
     strike_range = {"min": strike_values[0], "max": strike_values[-1]}
     selected_strategy = {"value": strategy_catalog()[0]["label"]}
-    chosen_contracts: list[dict] = []
+    chosen_contracts: list[dict[str, Any]] = []
 
     with dashboard_page(
         "Options Chain",
@@ -159,12 +161,11 @@ def options_page() -> None:
         expiry_select.on_value_change(lambda _: update_filters())
         min_strike.on_value_change(lambda _: update_filters())
         max_strike.on_value_change(lambda _: update_filters())
-        strategy_select.on_value_change(
-            lambda event: (
-                selected_strategy.__setitem__("value", event.value),
-                render_selection(),
-            )
-        )
+        def on_strategy_change(event) -> None:
+            selected_strategy["value"] = event.value  # type: ignore[assignment]
+            render_selection()
+
+        strategy_select.on_value_change(on_strategy_change)
 
         render_selection()
         render_chain()