Fix chart sizing issue on analytics dashboard

Charts were not rendering properly because admin-script.js targeted a
non-existent canvas ID (peptide-analytics-chart) instead of the actual
IDs (pn-trends-chart, pn-devices-chart, pn-sources-chart). The script
also used hardcoded demo data instead of the peptideNewsDashboardData
object exported from PHP.

Changes:
- Rewrite admin-script.js to initialise all three dashboard charts
  (line, doughnut, bar) using the correct canvas IDs and PHP data
- Set maintainAspectRatio: false so explicit canvas heights are respected
- Add max-height CSS constraint on chart canvases to prevent unbounded
  vertical growth
- Sync JS/CSS to admin/ root directory to match PEPTIDE_NEWS_PLUGIN_URL
  asset path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin/css/admin-style.css

@@ -0,0 +1,139 @@
+/**
+ * Peptide News — Admin Styles
+ *
+ * @since 1.0.0
+ */
+
+/* Dashboard layout */
+.peptide-news-dashboard {
+    max-width: 1400px;
+}
+
+/* Date filter bar */
+.pn-date-filter {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    margin: 20px 0;
+    padding: 15px 20px;
+    background: #fff;
+    border: 1px solid #e2e8f0;
+    border-radius: 8px;
+}
+
+.pn-date-filter input[type="date"] {
+    padding: 6px 10px;
+    border: 1px solid #cbd5e1;
+    border-radius: 6px;
+}
+
+/* Summary cards */
+.pn-summary-cards {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+    gap: 16px;
+    margin: 20px 0;
+}
+
+.pn-card {
+    background: #fff;
+    border: 1px solid #e2e8f0;
+    border-radius: 10px;
+    padding: 24px;
+    text-align: center;
+    transition: box-shadow 0.2s ease;
+}
+
+.pn-card:hover {
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
+}
+
+.pn-card h3 {
+    font-size: 32px;
+    font-weight: 700;
+    color: #1e293b;
+    margin: 0 0 4px;
+}
+
+.pn-card p {
+    font-size: 13px;
+    color: #64748b;
+    margin: 0;
+    text-transform: uppercase;
+    letter-spacing: 0.5px;
+}
+
+/* Charts */
+.pn-charts-row {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 20px;
+    margin: 20px 0;
+}
+
+.pn-chart-wide {
+    grid-column: 1 / -1;
+}
+
+.pn-chart-box {
+    background: #fff;
+    border: 1px solid #e2e8f0;
+    border-radius: 10px;
+    padding: 20px;
+    position: relative;
+}
+
+.pn-chart-box canvas {
+    max-height: 300px;
+    width: 100% !important;
+}
+
+.pn-chart-box h2 {
+    font-size: 16px;
+    font-weight: 600;
+    color: #334155;
+    margin: 0 0 16px;
+    padding: 0;
+}
+
+/* Tables */
+.pn-table-section {
+    margin: 30px 0;
+    background: #fff;
+    border: 1px solid #e2e8f0;
+    border-radius: 10px;
+    padding: 20px;
+}
+
+.pn-table-section h2 {
+    font-size: 16px;
+    font-weight: 600;
+    color: #334155;
+    margin: 0 0 16px;
+}
+
+.pn-table-section .wp-list-table {
+    border: none;
+}
+
+/* Articles page title count */
+.title-count {
+    font-weight: 400;
+    color: #64748b;
+    font-size: 16px;
+}
+
+/* Responsive */
+@media (max-width: 782px) {
+    .pn-charts-row {
+        grid-template-columns: 1fr;
+    }
+
+    .pn-summary-cards {
+        grid-template-columns: repeat(2, 1fr);
+    }
+
+    .pn-date-filter {
+        flex-wrap: wrap;
+    }
+}

admin/js/admin-script.js

@@ -0,0 +1,168 @@
+/**
+ * Admin JS for Peptide News Analytics Dashboard
+ *
+ * Initialises Chart.js charts using the data exported by dashboard.php
+ * via the global `peptideNewsDashboardData` object.
+ *
+ * @since 1.1.0
+ */
+
+(function () {
+    'use strict';
+
+    /* ── Guard: only run when dashboard data is available ── */
+    if (typeof peptideNewsDashboardData === 'undefined') {
+        return;
+    }
+
+    var data = peptideNewsDashboardData;
+
+    /* ── Shared colour palette ── */
+    var colours = {
+        blue:       'rgba(59, 130, 246, 1)',
+        blueFill:   'rgba(59, 130, 246, 0.08)',
+        green:      'rgba(16, 185, 129, 1)',
+        greenFill:  'rgba(16, 185, 129, 0.08)',
+        palette: [
+            'rgba(59, 130, 246, 0.85)',
+            'rgba(16, 185, 129, 0.85)',
+            'rgba(245, 158, 11, 0.85)',
+            'rgba(239, 68, 68, 0.85)',
+            'rgba(139, 92, 246, 0.85)',
+            'rgba(236, 72, 153, 0.85)',
+            'rgba(20, 184, 166, 0.85)',
+            'rgba(249, 115, 22, 0.85)'
+        ]
+    };
+
+    /* ── 1. Click Trends — Line Chart ── */
+    var trendsCanvas = document.getElementById('pn-trends-chart');
+    if (trendsCanvas && data.trends) {
+        var trendsLabels = data.trends.map(function (row) { return row.click_date; });
+        var trendsClicks = data.trends.map(function (row) { return parseInt(row.total_clicks, 10) || 0; });
+        var trendsUnique = data.trends.map(function (row) { return parseInt(row.total_unique, 10) || 0; });
+
+        new Chart(trendsCanvas, {
+            type: 'line',
+            data: {
+                labels: trendsLabels,
+                datasets: [
+                    {
+                        label: 'Total Clicks',
+                        data: trendsClicks,
+                        borderColor: colours.blue,
+                        backgroundColor: colours.blueFill,
+                        borderWidth: 2,
+                        pointRadius: 3,
+                        pointHoverRadius: 5,
+                        fill: true,
+                        tension: 0.3
+                    },
+                    {
+                        label: 'Unique Visitors',
+                        data: trendsUnique,
+                        borderColor: colours.green,
+                        backgroundColor: colours.greenFill,
+                        borderWidth: 2,
+                        pointRadius: 3,
+                        pointHoverRadius: 5,
+                        fill: true,
+                        tension: 0.3
+                    }
+                ]
+            },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                interaction: {
+                    mode: 'index',
+                    intersect: false
+                },
+                plugins: {
+                    legend: {
+                        position: 'top',
+                        labels: { usePointStyle: true, padding: 16 }
+                    }
+                },
+                scales: {
+                    x: {
+                        grid: { display: false },
+                        ticks: { maxTicksLimit: 12 }
+                    },
+                    y: {
+                        beginAtZero: true,
+                        ticks: { precision: 0 }
+                    }
+                }
+            }
+        });
+    }
+
+    /* ── 2. Device Breakdown — Doughnut Chart ── */
+    var devicesCanvas = document.getElementById('pn-devices-chart');
+    if (devicesCanvas && data.devices) {
+        var deviceLabels = data.devices.map(function (row) { return row.device_type || 'Unknown'; });
+        var deviceCounts = data.devices.map(function (row) { return parseInt(row.click_count, 10) || 0; });
+
+        new Chart(devicesCanvas, {
+            type: 'doughnut',
+            data: {
+                labels: deviceLabels,
+                datasets: [{
+                    data: deviceCounts,
+                    backgroundColor: colours.palette.slice(0, deviceLabels.length),
+                    borderWidth: 2,
+                    borderColor: '#fff'
+                }]
+            },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                plugins: {
+                    legend: {
+                        position: 'bottom',
+                        labels: { usePointStyle: true, padding: 12 }
+                    }
+                },
+                cutout: '55%'
+            }
+        });
+    }
+
+    /* ── 3. Source Performance — Bar Chart ── */
+    var sourcesCanvas = document.getElementById('pn-sources-chart');
+    if (sourcesCanvas && data.sources) {
+        var sourceLabels = data.sources.map(function (row) { return row.source || 'Unknown'; });
+        var sourceCounts = data.sources.map(function (row) { return parseInt(row.click_count, 10) || 0; });
+
+        new Chart(sourcesCanvas, {
+            type: 'bar',
+            data: {
+                labels: sourceLabels,
+                datasets: [{
+                    label: 'Clicks',
+                    data: sourceCounts,
+                    backgroundColor: colours.palette.slice(0, sourceLabels.length),
+                    borderRadius: 4,
+                    maxBarThickness: 48
+                }]
+            },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                plugins: {
+                    legend: { display: false }
+                },
+                scales: {
+                    x: {
+                        grid: { display: false }
+                    },
+                    y: {
+                        beginAtZero: true,
+                        ticks: { precision: 0 }
+                    }
+                }
+            }
+        });
+    }
+})();

peptide-news-plugin/admin/css/admin-style.css

@@ -80,6 +80,12 @@
     border: 1px solid #e2e8f0;
     border-radius: 10px;
     padding: 20px;
+    position: relative;
+}
+
+.pn-chart-box canvas {
+    max-height: 300px;
+    width: 100% !important;
 }
 
 .pn-chart-box h2 {

peptide-news-plugin/admin/js/admin-script.js

@@ -1,23 +1,168 @@
 /**
  * Admin JS for Peptide News Analytics Dashboard
+ *
+ * Initialises Chart.js charts using the data exported by dashboard.php
+ * via the global `peptideNewsDashboardData` object.
+ *
+ * @since 1.1.0
  */
 
 (function () {
-    const ctx = document.getElementById('peptide-analytics-chart')?.getContext('2d');
+    'use strict';
-    if (!ctx) return;
 
-    new Chart(ctx, {
+    /* ── Guard: only run when dashboard data is available ── */
+    if (typeof peptideNewsDashboardData === 'undefined') {
+        return;
+    }
+
+    var data = peptideNewsDashboardData;
+
+    /* ── Shared colour palette ── */
+    var colours = {
+        blue:       'rgba(59, 130, 246, 1)',
+        blueFill:   'rgba(59, 130, 246, 0.08)',
+        green:      'rgba(16, 185, 129, 1)',
+        greenFill:  'rgba(16, 185, 129, 0.08)',
+        palette: [
+            'rgba(59, 130, 246, 0.85)',
+            'rgba(16, 185, 129, 0.85)',
+            'rgba(245, 158, 11, 0.85)',
+            'rgba(239, 68, 68, 0.85)',
+            'rgba(139, 92, 246, 0.85)',
+            'rgba(236, 72, 153, 0.85)',
+            'rgba(20, 184, 166, 0.85)',
+            'rgba(249, 115, 22, 0.85)'
+        ]
+    };
+
+    /* ── 1. Click Trends — Line Chart ── */
+    var trendsCanvas = document.getElementById('pn-trends-chart');
+    if (trendsCanvas && data.trends) {
+        var trendsLabels = data.trends.map(function (row) { return row.click_date; });
+        var trendsClicks = data.trends.map(function (row) { return parseInt(row.total_clicks, 10) || 0; });
+        var trendsUnique = data.trends.map(function (row) { return parseInt(row.total_unique, 10) || 0; });
+
+        new Chart(trendsCanvas, {
             type: 'line',
             data: {
-            labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun'],
+                labels: trendsLabels,
                 datasets: [
                     {
-                    label: 'Clicks',
+                        label: 'Total Clicks',
-                    data: [12, 19, 3, 5, 2, 3],
+                        data: trendsClicks,
-                    borderColor: 'rgb(75, 192, 192)',
+                        borderColor: colours.blue,
-                    tension: 0.1
+                        backgroundColor: colours.blueFill,
+                        borderWidth: 2,
+                        pointRadius: 3,
+                        pointHoverRadius: 5,
+                        fill: true,
+                        tension: 0.3
+                    },
+                    {
+                        label: 'Unique Visitors',
+                        data: trendsUnique,
+                        borderColor: colours.green,
+                        backgroundColor: colours.greenFill,
+                        borderWidth: 2,
+                        pointRadius: 3,
+                        pointHoverRadius: 5,
+                        fill: true,
+                        tension: 0.3
                     }
                 ]
+            },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                interaction: {
+                    mode: 'index',
+                    intersect: false
+                },
+                plugins: {
+                    legend: {
+                        position: 'top',
+                        labels: { usePointStyle: true, padding: 16 }
+                    }
+                },
+                scales: {
+                    x: {
+                        grid: { display: false },
+                        ticks: { maxTicksLimit: 12 }
+                    },
+                    y: {
+                        beginAtZero: true,
+                        ticks: { precision: 0 }
+                    }
+                }
             }
         });
+    }
+
+    /* ── 2. Device Breakdown — Doughnut Chart ── */
+    var devicesCanvas = document.getElementById('pn-devices-chart');
+    if (devicesCanvas && data.devices) {
+        var deviceLabels = data.devices.map(function (row) { return row.device_type || 'Unknown'; });
+        var deviceCounts = data.devices.map(function (row) { return parseInt(row.click_count, 10) || 0; });
+
+        new Chart(devicesCanvas, {
+            type: 'doughnut',
+            data: {
+                labels: deviceLabels,
+                datasets: [{
+                    data: deviceCounts,
+                    backgroundColor: colours.palette.slice(0, deviceLabels.length),
+                    borderWidth: 2,
+                    borderColor: '#fff'
+                }]
+            },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                plugins: {
+                    legend: {
+                        position: 'bottom',
+                        labels: { usePointStyle: true, padding: 12 }
+                    }
+                },
+                cutout: '55%'
+            }
+        });
+    }
+
+    /* ── 3. Source Performance — Bar Chart ── */
+    var sourcesCanvas = document.getElementById('pn-sources-chart');
+    if (sourcesCanvas && data.sources) {
+        var sourceLabels = data.sources.map(function (row) { return row.source || 'Unknown'; });
+        var sourceCounts = data.sources.map(function (row) { return parseInt(row.click_count, 10) || 0; });
+
+        new Chart(sourcesCanvas, {
+            type: 'bar',
+            data: {
+                labels: sourceLabels,
+                datasets: [{
+                    label: 'Clicks',
+                    data: sourceCounts,
+                    backgroundColor: colours.palette.slice(0, sourceLabels.length),
+                    borderRadius: 4,
+                    maxBarThickness: 48
+                }]
+            },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                plugins: {
+                    legend: { display: false }
+                },
+                scales: {
+                    x: {
+                        grid: { display: false }
+                    },
+                    y: {
+                        beginAtZero: true,
+                        ticks: { precision: 0 }
+                    }
+                }
+            }
+        });
+    }
 })();