Amplia el dashboard de Home: KPIs, saldos, comparativa y movimientos

home() (views.py) y expenses/home.html pasan de mostrar tres numeros
sueltos y un listado plano de ultimos gastos a un panel mas completo:

- Saldo total y desglose por cuenta (account_balances/total_balance),
  calculado con dos queries agregadas (values().annotate(Sum(...)))
  en vez de N+1 llamadas a account.current_balance() en un bucle.
- Comparativa del gasto del mes en curso contra el mes anterior
  (prev_total/diff_amount/diff_pct), con aviso de que el mes en curso
  esta incompleto y la comparacion no es equivalente.
- Avisos (has_alerts) cuando hay objetivos excedidos o cuentas en
  negativo, con enlace directo a objetivos/cuentas.
- "Ultimos movimientos" mezcla gastos e ingresos (antes solo se veian
  los ultimos gastos) ordenados por fecha, con icono/color segun tipo.
- Se reutiliza una unica query de Goal tanto para el widget de
  objetivos (show_on_home) como para las alertas de excedidos
  (is_exceeded()), en vez de dos queries separadas.

base.css: nuevo bloque "/* Home widgets */" con las clases que usa la
plantilla (.home-section, .kpi-grid/.kpi-card, .balance-*,
.movements-list/.movement-*, .amount-positive/.amount-negative,
.comparison), incluyendo un ajuste responsive que oculta la cuenta en
movil (<480px).

No relacionado con los formularios de los commits anteriores; se
incluye aqui porque estaba pendiente de subir en la misma rama.

expenses_manager/expenses/static/expenses/css/base.css

@@ -909,6 +909,115 @@ tr:hover {
     color: var(--color-text-muted);
 }
 
+/* ========================= */
+/* Home widgets */
+/* ========================= */
+
+.home-section {
+    margin-bottom: 2.5rem;
+}
+
+.home-section > h2 {
+    margin-bottom: 0.75rem;
+}
+
+.section-actions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.5rem;
+    margin-top: 1.25rem;
+}
+
+.balance-total {
+    font-size: 2rem;
+    font-weight: 600;
+    color: var(--color-success-accent);
+    margin: 0 0 1rem;
+}
+
+.balance-total.negative,
+.balance-amount.negative {
+    color: var(--color-danger-accent);
+}
+
+.balance-breakdown {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+    max-width: 420px;
+}
+
+.balance-breakdown li {
+    display: flex;
+    justify-content: space-between;
+    padding: 0.4rem 0;
+    border-bottom: 1px solid var(--color-border);
+}
+
+.balance-amount {
+    font-variant-numeric: tabular-nums;
+    white-space: nowrap;
+}
+
+.movements-list {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+}
+
+.movement {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    padding: 0.5rem 0;
+    border-bottom: 1px solid var(--color-border);
+}
+
+.movement-date {
+    flex-shrink: 0;
+    font-size: 0.85rem;
+    color: var(--color-text-muted);
+    font-variant-numeric: tabular-nums;
+}
+
+.movement-label {
+    flex: 1;
+    min-width: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.movement-account {
+    flex-shrink: 0;
+    font-size: 0.85rem;
+    color: var(--color-text-muted);
+}
+
+.movement-amount {
+    flex-shrink: 0;
+    font-variant-numeric: tabular-nums;
+    white-space: nowrap;
+}
+
+.amount-positive {
+    color: var(--color-success-accent);
+}
+
+.amount-negative {
+    color: var(--color-danger-accent);
+}
+
+.comparison {
+    margin-top: 1rem;
+}
+
+@media (max-width: 480px) {
+    .movement-account {
+        display: none;
+    }
+}
+
 /* ========================= */
 /* Responsive */
 /* ========================= */

expenses_manager/expenses/templates/expenses/home.html

@@ -8,29 +8,111 @@
 
     <h1>Home</h1>
 
-    <section>
+    {% if has_alerts %}
-        <h2>Resumen del mes</h2>
+        <div class="messages">
-        <p>Total: {{ kpi_total|floatformat:2 }}</p>
+            {% for goal in exceeded_goals %}
-        <p>Gastos: {{ kpi_count }}</p>
+                <div class="message warning">
-        <p>Categorías: {{ kpi_categories }}</p>
+                    Presupuesto <strong>{{ goal.name }}</strong> excedido:
-    </section>
+                    {{ goal.progress|floatformat:2 }}€ de {{ goal.target_amount|floatformat:2 }}€.
+                    <a href="{% url 'goal_list' %}">Ver objetivos</a>
+                </div>
+            {% endfor %}
+            {% for item in negative_accounts %}
+                <div class="message error">
+                    La cuenta <strong>{{ item.account.name }}</strong> está en negativo:
+                    {{ item.balance|floatformat:2 }}€.
+                    <a href="{% url 'account_list' %}">Ver cuentas</a>
+                </div>
+            {% endfor %}
+        </div>
+    {% endif %}
 
-    <section>
+    <section class="home-section">
-        <h2>Últimos gastos</h2>
+        <h2>Saldo total</h2>
-        <ul>
+        <p class="balance-total {% if total_balance < 0 %}negative{% endif %}">
-            {% for expense in last_expenses %}
+            {{ total_balance|floatformat:2 }}€
+        </p>
+
+        <ul class="balance-breakdown">
+            {% for item in account_balances %}
                 <li>
-                    {{ expense.date }} - 
+                    <span class="balance-account">{{ item.account.name }}</span>
-                    {{ expense.category.name }} - 
+                    <span class="balance-amount {% if item.balance < 0 %}negative{% endif %}">
-                    {{ expense.amount }}
+                        {{ item.balance|floatformat:2 }}€
+                    </span>
                 </li>
             {% empty %}
-                <li>No hay gastos</li>
+                <li class="muted">No tienes cuentas activas.</li>
             {% endfor %}
         </ul>
     </section>
 
-    <section>
+    <section class="home-section">
+        <h2>Resumen del mes</h2>
+
+        <div class="kpi-grid">
+            <div class="kpi-card">
+                <span class="kpi-label">Gastado este mes</span>
+                <span class="kpi-value">{{ kpi_total|floatformat:2 }}€</span>
+            </div>
+            <div class="kpi-card">
+                <span class="kpi-label">Nº de gastos</span>
+                <span class="kpi-value">{{ kpi_count }}</span>
+            </div>
+            <div class="kpi-card">
+                <span class="kpi-label">Categorías usadas</span>
+                <span class="kpi-value">{{ kpi_categories }}</span>
+            </div>
+        </div>
+
+        <p class="comparison">
+            {% if diff_pct is None %}
+                <span class="muted">Sin gastos el mes pasado para comparar.</span>
+            {% else %}
+                Mes anterior: {{ prev_total|floatformat:2 }}€ —
+                {% if diff_amount > 0 %}
+                    <span class="amount-negative">
+                        +{{ diff_amount|floatformat:2 }}€ ({{ diff_pct|floatformat:1 }}%)
+                    </span>
+                {% elif diff_amount < 0 %}
+                    <span class="amount-positive">
+                        {{ diff_amount|floatformat:2 }}€ ({{ diff_pct|floatformat:1 }}%)
+                    </span>
+                {% else %}
+                    sin variación
+                {% endif %}
+            {% endif %}
+            <br>
+            <small class="muted">
+                El mes en curso está incompleto: la comparación no es equivalente
+                hasta que termine.
+            </small>
+        </p>
+    </section>
+
+    <section class="home-section">
+        <h2>Últimos movimientos</h2>
+        <ul class="movements-list">
+            {% for mov in movements %}
+                <li class="movement">
+                    <span class="movement-date">{{ mov.date }}</span>
+                    <span class="movement-label">{{ mov.label }}</span>
+                    <span class="movement-account muted">{{ mov.account }}</span>
+                    <span class="movement-amount {% if mov.kind == 'income' %}amount-positive{% else %}amount-negative{% endif %}">
+                        {% if mov.kind == 'income' %}+{% else %}−{% endif %}{{ mov.amount|floatformat:2 }}€
+                    </span>
+                </li>
+            {% empty %}
+                <li class="muted">Todavía no hay movimientos.</li>
+            {% endfor %}
+        </ul>
+        <div class="section-actions">
+            <a class="btn btn-secondary" href="{% url 'expense_list' %}">Ver todos los gastos</a>
+            <a class="btn btn-secondary" href="{% url 'income_list' %}">Ver todos los ingresos</a>
+        </div>
+    </section>
+
+    <section class="home-section">
         <div class="dashboard-grid">
             <div class="card card-chart">
                 <h2>Últimos meses</h2>
@@ -79,32 +161,39 @@
                 applyCartesianColors(chart, colors);
             });
         </script>
-
     </section>
 
-    <h3>Objetivos</h3>
+    <section class="home-section">
-    {% if goals %}
+        <h2>Objetivos</h2>
-        <div class="goals-widget">
+        {% if goals %}
-            {% for goal in goals %}
+            <div class="goals-widget">
-                <div class="goal-card">
+                {% for goal in goals %}
-                    <strong>{{ goal.name }}</strong>
+                    <div class="goal-card">
-                    {% if goal.is_exceeded %}
+                        <strong>{{ goal.name }}</strong>
-                        <span class="badge badge-inactive">Excedido</span>
+                        {% if goal.is_exceeded %}
-                    {% endif %}
+                            <span class="badge badge-inactive">Excedido</span>
+                        {% endif %}
 
-                    <div class="progress-bar">
+                        <div class="progress-bar"
-                        <div class="progress-fill {{ goal.progress_state }}"
+                            role="progressbar"
-                            style="width: {{ goal.bar_width|unlocalize }}%"></div>
+                            aria-valuemin="0"
+                            aria-valuemax="100"
+                            aria-valuenow="{{ goal.bar_width|unlocalize }}"
+                            aria-label="Progreso de {{ goal.name }}"
+                            aria-valuetext="{{ goal.progress|floatformat:1 }}€ de {{ goal.target_amount|floatformat:1 }}€ ({{ goal.percentage|floatformat:1 }}%)">
+                            <div class="progress-fill {{ goal.progress_state }}"
+                                style="width: {{ goal.bar_width|unlocalize }}%"></div>
+                        </div>
+
+                        <span class="progress-label">
+                            {{ goal.progress|floatformat:1 }}€ / {{ goal.target_amount|floatformat:1 }}€ ({{ goal.percentage|floatformat:1 }}%)
+                        </span>
                     </div>
-
+                {% endfor %}
-                    <span class="progress-label">
+            </div>
-                        {{ goal.progress|floatformat:1 }}€ / {{ goal.target_amount|floatformat:1 }}€ ({{ goal.percentage|floatformat:1 }}%)
+        {% else %}
-                    </span>
+            <p class="muted">No tienes objetivos aún.</p>
-                </div>
+        {% endif %}
-            {% endfor %}
+    </section>
-        </div>
-    {% else %}
-        <p>No tienes objetivos aún.</p>
-    {% endif %}
 
 {% endblock %}

expenses_manager/expenses/views.py

@@ -1,6 +1,7 @@
 import logging
 import calendar
 from datetime import date, datetime
+from decimal import Decimal
 from django.contrib import messages
 from .models import Account, Category, Expense, FuelEntry, Tag, Income, Goal
 from .forms import (
@@ -58,21 +59,108 @@ def sub_months(year, month, n):
 
 @login_required
 def home(request):
+    today = date.today()
     expenses = Expense.objects.filter(owner=request.user)
 
-    # Last expenses
+    # ---- KPIs del mes en curso ----
-    last_expenses = expenses.select_related("category").order_by("-date")[:5]
-
-    # Simple KPIs (current month)
-    today = date.today()
     month_expenses = expenses.filter(date__year=today.year, date__month=today.month)
-
+    kpi_total = month_expenses.aggregate(total=Sum("amount"))["total"] or Decimal("0")
-    kpi_total = month_expenses.aggregate(total=Sum("amount"))["total"] or 0
-
     kpi_count = month_expenses.count()
-
     kpi_categories = month_expenses.values("category").distinct().count()
 
+    # ---- Comparativa con el mes anterior ----
+    prev_year, prev_month = sub_months(today.year, today.month, 1)
+    prev_total = (
+        expenses.filter(date__year=prev_year, date__month=prev_month).aggregate(
+            total=Sum("amount")
+        )["total"]
+        or Decimal("0")
+    )
+    diff_amount = kpi_total - prev_total
+    # None cuando no hay mes anterior con gastos (evita división por cero)
+    diff_pct = None
+    if prev_total:
+        diff_pct = (diff_amount / prev_total) * 100
+
+    # ---- Saldos de cuentas ----
+    # Dos queries agregadas en lugar de N+1 (nada de account.current_balance() en bucle).
+    accounts = list(Account.objects.filter(owner=request.user, active=True))
+    account_ids = [a.id for a in accounts]
+
+    expense_totals = {
+        row["account_id"]: row["total"]
+        for row in Expense.objects.filter(account_id__in=account_ids)
+        .values("account_id")
+        .annotate(total=Sum("amount"))
+    }
+    income_totals = {
+        row["account_id"]: row["total"]
+        for row in Income.objects.filter(account_id__in=account_ids)
+        .values("account_id")
+        .annotate(total=Sum("amount"))
+    }
+
+    account_balances = []
+    negative_accounts = []
+    total_balance = Decimal("0")
+    for acc in accounts:
+        balance = (
+            acc.initial_balance
+            + (income_totals.get(acc.id) or Decimal("0"))
+            - (expense_totals.get(acc.id) or Decimal("0"))
+        )
+        total_balance += balance
+        account_balances.append({"account": acc, "balance": balance})
+        if balance < 0:
+            negative_accounts.append({"account": acc, "balance": balance})
+
+    # ---- Objetivos ----
+    # Una sola query reutilizada para "goals" (home) y "exceeded_goals" (alertas).
+    # is_exceeded() solo aplica a kind == budget, así que pago y ahorro nunca la disparan.
+    all_goals = list(
+        Goal.objects.filter(owner=request.user).select_related("category", "account")
+    )
+    goals = [g for g in all_goals if g.show_on_home]
+    exceeded_goals = [g for g in all_goals if g.is_exceeded()]
+
+    has_alerts = bool(exceeded_goals or negative_accounts)
+
+    # ---- Últimos movimientos (gastos + ingresos mezclados) ----
+    recent_expenses = expenses.select_related("category", "account").order_by(
+        "-date", "-id"
+    )[:8]
+    recent_incomes = (
+        Income.objects.filter(owner=request.user)
+        .select_related("account")
+        .order_by("-date", "-id")[:8]
+    )
+
+    movements = sorted(
+        [
+            {
+                "kind": "expense",
+                "date": e.date,
+                "label": e.category.name,
+                "account": e.account.name,
+                "amount": e.amount,
+            }
+            for e in recent_expenses
+        ]
+        + [
+            {
+                "kind": "income",
+                "date": i.date,
+                "label": i.name,
+                "account": i.account.name,
+                "amount": i.amount,
+            }
+            for i in recent_incomes
+        ],
+        key=lambda m: m["date"],
+        reverse=True,
+    )[:8]
+
+    # ---- Mini-gráfico de 6 meses (sin cambios) ----
     six_months = []
     for i in range(5, -1, -1):
         y, m = sub_months(today.year, today.month, i)
@@ -86,28 +174,28 @@ def home(request):
             ]
             or 0
         )
-
+        mini_data.append({"label": f"{m}/{y}", "total": float(total)})
-        mini_data.append(
-            {
-                "label": f"{m}/{y}",
-                "total": float(total),
-            }
-        )
-
-    goals = Goal.objects.filter(owner=request.user, show_on_home=True)
 
     return render(
         request,
         "expenses/home.html",
         {
             "active_menu": "home",
-            "last_expenses": last_expenses,
             "kpi_total": kpi_total,
             "kpi_count": kpi_count,
             "kpi_categories": kpi_categories,
+            "prev_total": prev_total,
+            "diff_amount": diff_amount,
+            "diff_pct": diff_pct,
+            "total_balance": total_balance,
+            "account_balances": account_balances,
+            "negative_accounts": negative_accounts,
+            "goals": goals,
+            "exceeded_goals": exceeded_goals,
+            "has_alerts": has_alerts,
+            "movements": movements,
             "mini_chart_labels": [x["label"] for x in mini_data],
             "mini_chart_data": [x["total"] for x in mini_data],
-            "goals": goals,
         },
     )