fitness: add complete fitness tracker frontend

- 5-tab layout (Profile, History, Workout, Exercises, Measure) with shared header nav
- Workout system: template CRUD, active workout on /fitness/workout/active with localStorage persistence, pause/resume timer, rest timer, RPE input
- Shared workout singleton (getWorkout) so active workout state is accessible across all fitness routes
- Floating workout FAB indicator on all /fitness routes when workout is active
- AddActionButton component for button-based FABs (measure + template creation)
- Profile page with workouts-per-week bar chart and weight line chart with SMA trend line + ±1σ confidence band
- Exercise detail with history, charts, and records tabs using static exercise data
- Session history with grouped-by-month list, session detail with stats/PRs
- Body measurements with latest values, body part display, add form
- Card styling matching rosary/prayer route patterns (accent-dark, nord5 light, box-shadow, hover lift)
- FitnessChart: fix SSR hang by moving Chart.register to client-side, remove redundant $effect
- Exercise API: use static in-repo data instead of empty MongoDB collection
- Workout finish: include exercise name for WorkoutSession model validation

src/models/BodyMeasurement.ts

@@ -0,0 +1,99 @@
+import mongoose from 'mongoose';
+
+export interface IBodyPartMeasurements {
+	neck?: number;
+	shoulders?: number;
+	chest?: number;
+	leftBicep?: number;
+	rightBicep?: number;
+	leftForearm?: number;
+	rightForearm?: number;
+	waist?: number;
+	hips?: number;
+	leftThigh?: number;
+	rightThigh?: number;
+	leftCalf?: number;
+	rightCalf?: number;
+}
+
+export interface IBodyMeasurement {
+	_id?: string;
+	date: Date;
+	weight?: number;
+	bodyFatPercent?: number;
+	caloricIntake?: number;
+	measurements?: IBodyPartMeasurements;
+	notes?: string;
+	createdBy: string;
+	createdAt?: Date;
+	updatedAt?: Date;
+}
+
+const BodyPartMeasurementsSchema = new mongoose.Schema(
+	{
+		neck: { type: Number, min: 0 },
+		shoulders: { type: Number, min: 0 },
+		chest: { type: Number, min: 0 },
+		leftBicep: { type: Number, min: 0 },
+		rightBicep: { type: Number, min: 0 },
+		leftForearm: { type: Number, min: 0 },
+		rightForearm: { type: Number, min: 0 },
+		waist: { type: Number, min: 0 },
+		hips: { type: Number, min: 0 },
+		leftThigh: { type: Number, min: 0 },
+		rightThigh: { type: Number, min: 0 },
+		leftCalf: { type: Number, min: 0 },
+		rightCalf: { type: Number, min: 0 }
+	},
+	{ _id: false }
+);
+
+const BodyMeasurementSchema = new mongoose.Schema(
+	{
+		date: {
+			type: Date,
+			required: true,
+			default: Date.now
+		},
+		weight: {
+			type: Number,
+			min: 0,
+			max: 500
+		},
+		bodyFatPercent: {
+			type: Number,
+			min: 0,
+			max: 100
+		},
+		caloricIntake: {
+			type: Number,
+			min: 0,
+			max: 50000
+		},
+		measurements: {
+			type: BodyPartMeasurementsSchema
+		},
+		notes: {
+			type: String,
+			trim: true,
+			maxlength: 500
+		},
+		createdBy: {
+			type: String,
+			required: true,
+			trim: true
+		}
+	},
+	{
+		timestamps: true,
+		toJSON: { virtuals: true },
+		toObject: { virtuals: true }
+	}
+);
+
+BodyMeasurementSchema.index({ createdBy: 1, date: -1 });
+
+export const BodyMeasurement = mongoose.model<IBodyMeasurement>(
+	'BodyMeasurement',
+	BodyMeasurementSchema
+);