feat: add profile settings page and fixed-taxonomy WorkoutKinds UI with pace/HR-zone editing

frontend/src/App.tsx

@@ -2,6 +2,7 @@ import { useState } from "react";
 import "./App.css";
 import { GarminConnection } from "./components/GarminConnection";
 import { Dashboard } from "./pages/Dashboard";
+import { Profile } from "./pages/Profile";
 import { ReviewQueue } from "./pages/ReviewQueue";
 import { WorkoutKinds } from "./pages/WorkoutKinds";
 
@@ -9,6 +10,7 @@ const TABS = [
   { key: "dashboard", label: "Progression", Component: Dashboard },
   { key: "review", label: "Review Queue", Component: ReviewQueue },
   { key: "kinds", label: "Workout Kinds", Component: WorkoutKinds },
+  { key: "profile", label: "Profile", Component: Profile },
 ] as const;
 
 type TabKey = (typeof TABS)[number]["key"];