Rebuild /dashboard with charts, add Grand livre/Dashboard nav

Nav: a small "Grand livre" / "Dashboard" switcher, top-right on both
pages, with the current page highlighted. Needed hook_theme() to
declare current_route as an accepted variable for both theme hooks --
same class of bug as the earlier can_view_history fix: an undeclared
variable passed via the render array is silently dropped rather than
reaching Twig.

Dashboard: replaced the old "solde par compte / par client" tables
(computed client-side from a full unwindowed JSON:API fetch of every
node -- the same performance problem the /lignes sliding window was
built to avoid, just not yet felt at 1500+ lines) with a single
aggregate endpoint (DashboardStatsController, plain SQL GROUP BY) and
five chart panels: CA par année, solde par compte (diverging,
red/green), solde par compte trend (small multiples per compte),
répartition par type, top clients par CA. No charting library --
small dependency-free div/CSS bar charts (HBarChart/ColumnChart/
MiniTrend components in dashboard.js), consistent with this project
vendoring its own JS.

Two data-correctness fixes along the way: (1) the historical stray
mistyped dates (0213-06-15, 2015-08-29 -- preserved as-is per this
module's policy) needed excluding from per-year buckets without
excluding their money from all-time totals, so the filtering happens
per-output-field in PHP rather than as a blanket SQL date range. (2)
PHP silently casts numeric-looking array keys ("2021") to actual
integers, so array_keys() on a year-keyed map produces a mix of ints
and strings -- json_encode emits the int ones as bare JSON numbers in
a list (unlike object keys, which JSON always stringifies), which
broke the frontend's annees[i].slice(2) trend-card labels. Fixed with
an explicit array_map('strval', ...).

Verified: bar widths/colors match the underlying data exactly (e.g.
EXT.'s red bar is proportionally sized against Maud's green one per
their actual solde ratio), all 8 trend cards render correct year
labels, and both nav links correctly highlight on their own page.

web/modules/custom/figli_compta_ledger/templates/figli-compta-dashboard.html.twig

@@ -1,36 +1,69 @@
 {#
-  Aggregate view: solde par compte / solde par client. The spreadsheet-like
+  Charts and aggregate totals: solde par compte, chiffre d'affaires par
+  année, répartition par type, top clients. The spreadsheet-like
   line-by-line view is the site's home page (figli-compta-home.html.twig).
 
   {% verbatim %} below: this is Vue template syntax, not Twig -- both use
   {{ }}, so verbatim tells Twig to leave it alone and let Vue compile it
   in the browser.
 #}
+<nav class="figli-page-nav">
+  <a href="{{ path('figli_compta_ledger.home') }}" class="{{ current_route == 'figli_compta_ledger.home' ? 'is-active' : '' }}">Grand livre</a>
+  <a href="{{ path('figli_compta_ledger.dashboard') }}" class="{{ current_route == 'figli_compta_ledger.dashboard' ? 'is-active' : '' }}">Dashboard</a>
+</nav>
 {% verbatim %}
 <div id="figli-dashboard-app">
   <p v-if="loading">Chargement des données…</p>
   <p v-else-if="error" class="figli-error">Erreur de chargement du tableau de bord : {{ error }}</p>
   <template v-else>
-    <section v-for="table in tables" :key="table.title">
-      <h2>{{ table.title }}</h2>
-      <p class="figli-note" v-if="table.note">{{ table.note }}</p>
-      <table>
-        <thead><tr><th></th><th>Entrées (+)</th><th>Sorties (-)</th><th>Solde</th></tr></thead>
-        <tbody>
-          <tr v-for="row in table.rows" :key="row.name" :class="rowClass(row.solde)">
-            <td>{{ row.name }}</td>
-            <td class="amount">{{ formatEur(row.entrees) }}</td>
-            <td class="amount">{{ formatEur(row.sorties) }}</td>
-            <td class="amount">{{ formatEur(row.solde) }}</td>
-          </tr>
-          <tr class="total">
-            <td>TOTAL</td>
-            <td class="amount">{{ formatEur(table.totals.entrees) }}</td>
-            <td class="amount">{{ formatEur(table.totals.sorties) }}</td>
-            <td class="amount">{{ formatEur(table.totals.solde) }}</td>
-          </tr>
-        </tbody>
-      </table>
+    <div class="figli-summary-row">
+      <div class="figli-summary-card">
+        <div class="figli-summary-label">Chiffre d'affaires total</div>
+        <div class="figli-summary-value">{{ formatEurRound(totalCA) }}</div>
+      </div>
+      <div class="figli-summary-card" v-if="caAnneeEnCours">
+        <div class="figli-summary-label">CA {{ caAnneeEnCours.annee }}</div>
+        <div class="figli-summary-value">{{ formatEurRound(caAnneeEnCours.value) }}</div>
+      </div>
+      <div class="figli-summary-card" v-for="item in soldeParCompteItems.slice(0, 1)" :key="'top-' + item.label">
+        <div class="figli-summary-label">Meilleur solde</div>
+        <div class="figli-summary-value" :class="item.value < 0 ? 'is-negative' : 'is-positive'">{{ item.label }} · {{ formatEurRound(item.value) }}</div>
+      </div>
+    </div>
+
+    <section class="figli-chart-section">
+      <h2>Chiffre d'affaires par année</h2>
+      <p class="figli-note">Total des entrées client (montant HT) facturées chaque année.</p>
+      <column-chart :items="caParAnneeItems" :format-value="formatEurRound"></column-chart>
+    </section>
+
+    <section class="figli-chart-section">
+      <h2>Solde par compte</h2>
+      <p class="figli-note">Solde cumulé de chaque compte depuis l'origine (ouverture comprise) -- vert = créditeur, rouge = débiteur.</p>
+      <h-bar-chart :items="soldeParCompteItems" :format-value="formatEurRound"></h-bar-chart>
+    </section>
+
+    <section class="figli-chart-section">
+      <h2>Évolution du solde par compte</h2>
+      <p class="figli-note">Solde de clôture de chaque compte, année par année.</p>
+      <div class="figli-trend-grid">
+        <div class="figli-trend-card" v-for="compte in comptesOrdonnes" :key="compte">
+          <div class="figli-trend-title">{{ compte }}</div>
+          <mini-trend :annees="stats.annees" :values="trendValues(compte)" :format-value="formatEurRound"></mini-trend>
+        </div>
+      </div>
+    </section>
+
+    <section class="figli-chart-section">
+      <h2>Répartition de l'activité par type</h2>
+      <p class="figli-note">Montant total (HT, valeur absolue) par type de ligne, hors ouvertures.</p>
+      <h-bar-chart :items="typeItems" :format-value="formatEurRound" :color-for="typeColor"></h-bar-chart>
+    </section>
+
+    <section class="figli-chart-section">
+      <h2>Top clients par chiffre d'affaires</h2>
+      <p class="figli-note">Les 12 clients ayant généré le plus de chiffre d'affaires, toutes années confondues.</p>
+      <h-bar-chart :items="topClientsItems" :format-value="formatEurRound"></h-bar-chart>
     </section>
   </template>
 </div>

web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig

@@ -5,6 +5,10 @@
   "Ajouter une ligne" opens the real Drupal node form in a modal
   (core/drupal.dialog.ajax) -- no form logic duplicated in JS.
 #}
+<nav class="figli-page-nav">
+  <a href="{{ path('figli_compta_ledger.home') }}" class="{{ current_route == 'figli_compta_ledger.home' ? 'is-active' : '' }}">Grand livre</a>
+  <a href="{{ path('figli_compta_ledger.dashboard') }}" class="{{ current_route == 'figli_compta_ledger.dashboard' ? 'is-active' : '' }}">Dashboard</a>
+</nav>
 {% verbatim %}
 <div id="figli-home-app">
   <div class="figli-toolbar">