[IMP] awesome_dashboard: add core dashboard features, dynamic widget framework

- Implement main dashboard layout with widget container and registry
- Add base widget class and example widget following tutorial pattern
- Integrate RPC calls for dynamic data fetching in widgets
- Setup dashboard service to manage widget lifecycle and events
- Configure QWeb templates and assets for widget rendering
- Enable mounting and updating of widgets via Owl framework

Author: jcha-odoo

awesome_dashboard/static/src/dashboard.js

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+/** @odoo-module **/
+
+import { _t } from "@web/core/l10n/translation";
+import { Component, useState } from "@odoo/owl";
+import { registry } from "@web/core/registry";
+import { Layout } from '@web/search/layout'
+import { useService } from "@web/core/utils/hooks";
+import { DashboardItem } from "../dashboarditem/dashboarditem";
+import { PieChart } from "../piechart/piechart";
+
+class AwesomeDashboard extends Component {
+    static template = "awesome_dashboard.AwesomeDashboard";
+    static components = { Layout, DashboardItem, PieChart }
+    
+    setup() {
+        const { status } = owl;
+        this.action = useService("action");
+        this.state = useState({ items: [], chart: {} });
+        this.statisticsService = useService('statistics');
+        this.loadStatisticsData();
+    }
+
+    
+    async loadStatisticsData() {
+        let result = await this.statisticsService.loadStatistics();
+        this.state.items = [
+            {
+                id: 1,
+                title: 'Number of new orders this month',
+                value: result.nb_new_orders
+            },
+            {
+                id: 2,
+                title: 'Total amount of new orders this month',
+                value: result.nb_new_orders
+            },
+            {
+                id: 3,
+                title: 'Average amount of t-shirt by order this month',
+                value: result.nb_new_orders
+            },
+            {
+                id: 4,
+                title: 'Number of cancelled orders this month',
+                value: result.nb_cancelled_orders
+            },
+            {
+                id: 5,
+                title: "Average time for an order to go from ‘new’ to ‘sent’ or ‘cancelled`",
+                value: result.average_time
+            }
+        ];
+        this.state.chart = result.orders_by_size;
+
+    }
+
+    openCustomers() {
+        this.action.doAction("contacts.action_contacts");
+    }
+
+    openLeads() {
+        this.action.doAction({
+            type: 'ir.actions.act_window',
+            name: _t('Leads'),
+            target: 'current',
+            res_model: 'crm.lead',
+            views: [[false, 'kanban'], [false, 'list'], [false, 'form']],    // [view_id, view_type]
+        });
+    }
+}
+
+registry.category("actions").add("awesome_dashboard.dashboard", AwesomeDashboard);

awesome_dashboard/static/src/dashboard.xml

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+.o_dashboard {
+    display: flex;
+    flex-wrap: wrap;
+}

awesome_dashboard/static/src/dashboard/dashboard.js

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+    <t t-name="awesome_dashboard.AwesomeDashboard">
+        <Layout className="'o_dashboard'" display="{controlPanel: {}}">
+            <t t-set-slot="layout-buttons">
+                <button type="button" class="btn btn-primary" t-on-click="openCustomers">Customers</button>
+                <button type="button" class="btn btn-primary" t-on-click="openLeads">Leads</button>
+            </t>
+            <t t-foreach="state.items" t-as="item" t-key="item_index">
+                <DashboardItem size="2">
+                    <h2 class="text-lg-center">
+                        <t t-esc="item.title"/>
+                    </h2>
+                    <div class="text-success text-bold text-lg-center" style="font-size: 38px; font-weight: bold">
+                        <t t-esc="item.value"/>
+                    </div>
+                </DashboardItem>
+            </t>
+            <DashboardItem>
+                <PieChart t-props='{
+                    key_value: state.chart
+                }' />
+            </DashboardItem>
+        </Layout>
+    </t>
+</templates>

awesome_dashboard/static/src/dashboard/dashboard.scss

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+import { Component } from '@odoo/owl';
+
+export class DashboardItem extends Component {
+    static template = "awesome_dashboard.dashboardItem"
+    static components = {}
+    static props = {
+        size: {
+            type: Number,
+            optional: true,
+            default: 2
+        },
+        slots: {
+            type: Object
+        }
+    }
+
+    setup() {}
+}

awesome_dashboard/static/src/dashboard/dashboard.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<templates xml:space="preserve">
+    <t t-name="awesome_dashboard.dashboardItem">
+        <div t-att-style="`width: ${18 * props.size}rem; border: 1px solid black;`" t-att-class="'m-3 p-3 d-inline-block'">
+            <t t-slot="default"/>
+        </div>
+    </t>
+</templates>

awesome_dashboard/static/src/dashboarditem/dashboarditem.js

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+"use strict";
+import { Component, onWillStart, useRef, useEffect } from '@odoo/owl'
+import { AssetsLoadingError, loadJS } from '@web/core/assets';
+
+export class PieChart extends Component {
+
+    static template = "awesome_dashboard.pieChart";
+    static components = {}
+    static props = {
+        key_value: Object
+    }
+
+    setup() {
+        this.canvasRef = useRef("canvas");
+
+        onWillStart(async () => {
+            try {
+                await loadJS(["/web/static/lib/Chart/Chart.js"]);
+            } 
+            catch (error) {
+                if (!(error instanceof AssetsLoadingError)) {
+                    throw error;
+                }
+            }
+        })
+
+        useEffect(() => this.renderPieChart())
+    }
+
+    renderPieChart() {
+        const ctx = this.canvasRef.el.getContext("2d");
+        this.chart = new Chart(ctx, {   
+            type: "pie",
+            data: {
+                labels: Object.keys(this.props.key_value), //["S", "M", "L", "XL", "XXL"],
+                datasets: [{
+                    data: Object.values(this.props.key_value), // [10, 20, 15, 5, 2]
+                }],
+            },
+            options: {
+                responsive: true,
+            },
+        });
+    }
+}

awesome_dashboard/static/src/dashboarditem/dashboarditem.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates>
+    <t t-name="awesome_dashboard.pieChart">
+        <canvas t-ref="canvas" width="300" height="300"></canvas>
+    </t>
+</templates>

awesome_dashboard/static/src/piechart/piechart.js

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+import { registry } from '@web/core/registry';
+import { rpc } from "@web/core/network/rpc";
+import { memoize } from "@web/core/utils/functions";
+
+const loadStatistics = memoize(async () => {
+    return await rpc("/awesome_dashboard/statistics");
+});
+
+export const statisticsService = {
+    dependencies: [],
+    start() {
+        return { loadStatistics };
+    },
+};
+
+registry.category("services").add("statistics", statisticsService);