[FEATURE] PWA + Showcase Grid

.gitignore

@@ -12,3 +12,4 @@
 node_modules/
 src/main/frontend/generated/
 vite.generated.ts
+/src/main/bundles/prod.bundle

CLAUDE.md

@@ -32,7 +32,7 @@ Vaadin Flow (server-side Java UI, no hand-written HTML/JS for views) on Spring B
 
 Since `apex-chart.ts` renders into light DOM (`createRenderRoot()` returns `this`), global CSS can reach into the chart markup — but series/legend/grid colors are driven entirely by the options JSON, not CSS, because ApexCharts renders its own SVG/canvas.
 
-**Views** (`views/`): `MainLayout` (`@Layout`, applies to all routes) is the `AppLayout` shell — navbar + `SideNav` drawer. `DashboardView` (`@Route("")`) is the only route; it wraps each chart in a card via a local `card(title, chart)` helper rather than adding charts directly.
+**Views** (`views/`): `MainLayout` (`@Layout`, applies to all routes) is the `AppLayout` shell — navbar + `SideNav` drawer, with one `SideNavItem` per route. Routes: `DashboardView` (`@Route("")`) wraps each chart in a `Card` (`components/Card.java`); `FormView` (`@Route("formular")`) demonstrates form controls bound via `Binder`; `TableView` (`@Route("tabelle")`) demonstrates a `Grid` over dummy data with a live text filter (`GridListDataView.addFilter`, `TextField` in `ValueChangeMode.EAGER`). New views should reuse `Card` to wrap their content rather than adding components directly, and get a matching `SideNavItem` in `MainLayout`.
 
 **Styling**: `src/main/resources/META-INF/resources/styles.css` is the one project-level stylesheet (loaded via `@StyleSheet("styles.css")` in `Application.java`). It defines `--dialect-*` design tokens (Dialect design system: primary orange `#E86C00`, cool-gray background, card radius/shadow) and aliases them onto Aura's own CSS custom properties (`--aura-accent-color-*`, `--aura-background-color-*`, `--aura-orange`, `--aura-yellow`) rather than fighting the theme. Aura tokens use OKLCH + relative-color syntax and accept plain hex overrides. When restyling, prefer extending this alias layer over hardcoding new colors in components.
 

package.json

@@ -40,7 +40,12 @@
     "transform-ast": "2.4.4",
     "typescript": "6.0.3",
     "vite": "8.0.16",
-    "vite-plugin-checker": "0.14.4"
+    "vite-plugin-checker": "0.14.4",
+    "workbox-build": "7.4.1",
+    "workbox-core": "7.4.1",
+    "workbox-precaching": "7.4.1",
+    "workbox-routing": "7.4.1",
+    "workbox-strategies": "7.4.1"
   },
   "vaadin": {
     "dependencies": {
@@ -81,9 +86,14 @@
       "transform-ast": "2.4.4",
       "typescript": "6.0.3",
       "vite": "8.0.16",
-      "vite-plugin-checker": "0.14.4"
+      "vite-plugin-checker": "0.14.4",
+      "workbox-build": "7.4.1",
+      "workbox-core": "7.4.1",
+      "workbox-precaching": "7.4.1",
+      "workbox-routing": "7.4.1",
+      "workbox-strategies": "7.4.1"
     },
-    "hash": "8bfc1d6a9ed865f834789abfbf3b610d4bb660aaee424aefb9e9ae718e11717b",
+    "hash": "c759239a4f6d12f111d0cab12fe3ce6fdb558c5f8e2a3f33425bcfb33577e99b",
     "overrides": {
       "@vaadin/a11y-base": "25.2.0",
       "@vaadin/accordion": "25.2.0",
@@ -169,7 +179,10 @@
       "proj4": "$proj4",
       "react": "$react",
       "react-dom": "$react-dom",
-      "react-router": "$react-router"
+      "react-router": "$react-router",
+      "workbox-build": {
+        "glob": "13.0.6"
+      }
     }
   },
   "overrides": {
@@ -202,7 +215,6 @@
     "@vaadin/progress-bar": "25.2.0",
     "@vaadin/multi-select-combo-box": "25.2.0",
     "proj4": "$proj4",
-    "apexcharts": "$apexcharts",
     "@vaadin/crud": "25.2.0",
     "react-router": "$react-router",
     "@vaadin/time-picker": "25.2.0",
@@ -257,6 +269,10 @@
     "@vaadin/rich-text-editor": "25.2.0",
     "@vaadin/vaadin-lumo-styles": "$@vaadin/vaadin-lumo-styles",
     "@vaadin/email-field": "25.2.0",
-    "@vaadin/message-input": "25.2.0"
+    "@vaadin/message-input": "25.2.0",
+    "workbox-build": {
+      "glob": "13.0.6"
+    },
+    "apexcharts": "$apexcharts"
   }
 }

src/main/java/com/example/Application.java

@@ -7,11 +7,13 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import com.vaadin.flow.component.dependency.StyleSheet;
 import com.vaadin.flow.component.page.AppShellConfigurator;
 import com.vaadin.flow.component.page.Push;
+import com.vaadin.flow.server.PWA;
 
 @SpringBootApplication
 @StyleSheet(Aura.STYLESHEET)
 @StyleSheet("styles.css") // Your custom styles
 @Push
+@PWA(name = "Dialect Charts", shortName = "Dialect", offlinePath = "offline.html")
 public class Application implements AppShellConfigurator {
 
     public static void main(String[] args) {

src/main/java/com/example/components/Card.java

@@ -0,0 +1,20 @@
+package com.example.components;
+
+import com.vaadin.flow.component.Component;
+import com.vaadin.flow.component.html.H3;
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+
+public class Card extends VerticalLayout {
+
+    public Card(String title, Component content) {
+        H3 heading = new H3(title);
+        heading.addClassName("dialect-card__title");
+
+        add(heading, content);
+
+        addClassName("dialect-card");
+        setWidthFull();
+        setPadding(false);
+        setSpacing(false);
+    }
+}

src/main/java/com/example/views/DashboardView.java

@@ -1,10 +1,9 @@
 package com.example.views;
 
 import com.example.components.BarChart;
+import com.example.components.Card;
 import com.example.components.LineChart;
 import com.example.components.PieChart;
-import com.vaadin.flow.component.Component;
-import com.vaadin.flow.component.html.H3;
 import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 import com.vaadin.flow.router.PageTitle;
@@ -51,20 +50,8 @@ public class DashboardView extends VerticalLayout {
             Notification.show("Slice %d".formatted(e.getDataPointIndex()));
         });
 
-        add(card("Umsatz-Entwicklung", lineChart),
+        add(new Card("Umsatz-Entwicklung", lineChart),
-                card("Umsatz nach Monat", barChart),
+                new Card("Umsatz nach Monat", barChart),
-                card("Umsatz nach Region", pieChart));
+                new Card("Umsatz nach Region", pieChart));
-    }
-
-    private Component card(String title, Component chart) {
-        H3 heading = new H3(title);
-        heading.addClassName("dialect-card__title");
-
-        VerticalLayout card = new VerticalLayout(heading, chart);
-        card.addClassName("dialect-card");
-        card.setWidthFull();
-        card.setPadding(false);
-        card.setSpacing(false);
-        return card;
     }
 }

src/main/java/com/example/views/FormView.java

@@ -1,5 +1,6 @@
 package com.example.views;
 
+import com.example.components.Card;
 import com.vaadin.flow.component.Component;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.button.ButtonVariant;
@@ -8,19 +9,13 @@ import com.vaadin.flow.component.checkbox.CheckboxGroup;
 import com.vaadin.flow.component.combobox.ComboBox;
 import com.vaadin.flow.component.datepicker.DatePicker;
 import com.vaadin.flow.component.formlayout.FormLayout;
-import com.vaadin.flow.component.html.H3;
 import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.component.notification.NotificationVariant;
 import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 import com.vaadin.flow.component.radiobutton.RadioButtonGroup;
 import com.vaadin.flow.component.select.Select;
-import com.vaadin.flow.component.textfield.BigDecimalField;
+import com.vaadin.flow.component.textfield.*;
-import com.vaadin.flow.component.textfield.EmailField;
-import com.vaadin.flow.component.textfield.IntegerField;
-import com.vaadin.flow.component.textfield.PasswordField;
-import com.vaadin.flow.component.textfield.TextArea;
-import com.vaadin.flow.component.textfield.TextField;
 import com.vaadin.flow.component.timepicker.TimePicker;
 import com.vaadin.flow.data.binder.Binder;
 import com.vaadin.flow.data.validator.EmailValidator;
@@ -45,7 +40,7 @@ public class FormView extends VerticalLayout {
 
     public FormView() {
         addClassName("dialect-content");
-        add(card("Registrierung", buildForm()));
+        add(new Card("Registrierung", buildForm()));
         //<theme-editor-local-classname>
         addClassName("form-view-vertical-layout-1");
     }
@@ -171,16 +166,4 @@ vorname.setAutofocus(true);
         wrapper.setSpacing(true);
         return wrapper;
     }
-
-    private Component card(String title, Component body) {
-        H3 heading = new H3(title);
-        heading.addClassName("dialect-card__title");
-
-        VerticalLayout card = new VerticalLayout(heading, body);
-        card.addClassName("dialect-card");
-        card.setWidthFull();
-        card.setPadding(false);
-        card.setSpacing(false);
-        return card;
-    }
 }

src/main/java/com/example/views/MainLayout.java

@@ -39,6 +39,8 @@ public class MainLayout extends AppLayout {
                 VaadinIcon.DASHBOARD.create()));
         nav.addItem(new SideNavItem("Formular", FormView.class,
                 VaadinIcon.FORM.create()));
+        nav.addItem(new SideNavItem("Tabelle", TableView.class,
+                VaadinIcon.TABLE.create()));
 
         addToDrawer(nav);
     }

src/main/java/com/example/views/TableView.java

@@ -0,0 +1,81 @@
+package com.example.views;
+
+import com.example.components.Card;
+import com.vaadin.flow.component.grid.Grid;
+import com.vaadin.flow.component.grid.dataview.GridListDataView;
+import com.vaadin.flow.component.icon.VaadinIcon;
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.component.textfield.TextField;
+import com.vaadin.flow.data.value.ValueChangeMode;
+import com.vaadin.flow.router.PageTitle;
+import com.vaadin.flow.router.Route;
+
+import java.text.NumberFormat;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Example view demonstrating a {@link Grid} with dummy data and a
+ * live text filter across all columns.
+ */
+@Route("tabelle")
+@PageTitle("Tabelle")
+public class TableView extends VerticalLayout {
+
+    private record Mitarbeiter(String name, String abteilung, String stadt, double gehalt) {
+    }
+
+    private static final List<Mitarbeiter> MITARBEITER = List.of(
+            new Mitarbeiter("Anna Schmidt", "Entwicklung", "Berlin", 68000),
+            new Mitarbeiter("Jonas Becker", "Vertrieb", "Hamburg", 54000),
+            new Mitarbeiter("Lena Fischer", "Marketing", "München", 59000),
+            new Mitarbeiter("Paul Wagner", "Support", "Köln", 47000),
+            new Mitarbeiter("Mia Hoffmann", "Geschäftsführung", "Frankfurt", 95000),
+            new Mitarbeiter("Felix Bauer", "Entwicklung", "Stuttgart", 71000),
+            new Mitarbeiter("Sophie Richter", "Vertrieb", "Wien", 52000),
+            new Mitarbeiter("Tim Klein", "Marketing", "Zürich", 63000),
+            new Mitarbeiter("Laura Wolf", "Support", "Leipzig", 45000),
+            new Mitarbeiter("Max Neumann", "Entwicklung", "Dresden", 69000),
+            new Mitarbeiter("Nina Schröder", "Geschäftsführung", "Düsseldorf", 98000),
+            new Mitarbeiter("David Zimmermann", "Vertrieb", "Nürnberg", 55000));
+
+    private static final NumberFormat GEHALT_FORMAT = NumberFormat.getCurrencyInstance(Locale.GERMANY);
+
+    public TableView() {
+        addClassName("dialect-content");
+
+        TextField suche = new TextField();
+        suche.setPlaceholder("Suchen…");
+        suche.setPrefixComponent(VaadinIcon.SEARCH.create());
+        suche.setClearButtonVisible(true);
+        suche.setValueChangeMode(ValueChangeMode.EAGER);
+        suche.setWidthFull();
+
+        Grid<Mitarbeiter> grid = new Grid<>();
+        grid.setWidthFull();
+        grid.addColumn(Mitarbeiter::name).setHeader("Name").setSortable(true);
+        grid.addColumn(Mitarbeiter::abteilung).setHeader("Abteilung").setSortable(true);
+        grid.addColumn(Mitarbeiter::stadt).setHeader("Stadt").setSortable(true);
+        grid.addColumn(m -> GEHALT_FORMAT.format(m.gehalt())).setHeader("Gehalt (€)").setSortable(true);
+
+        GridListDataView<Mitarbeiter> dataView = grid.setItems(MITARBEITER);
+        suche.addValueChangeListener(e -> dataView.refreshAll());
+        dataView.addFilter(mitarbeiter -> matches(mitarbeiter, suche.getValue()));
+
+        VerticalLayout content = new VerticalLayout(suche, grid);
+        content.setPadding(false);
+        content.setSpacing(true);
+
+        add(new Card("Mitarbeiter", content));
+    }
+
+    private static boolean matches(Mitarbeiter mitarbeiter, String filter) {
+        if (filter == null || filter.isBlank()) {
+            return true;
+        }
+        String suchbegriff = filter.trim().toLowerCase(Locale.GERMANY);
+        return mitarbeiter.name().toLowerCase(Locale.GERMANY).contains(suchbegriff)
+                || mitarbeiter.abteilung().toLowerCase(Locale.GERMANY).contains(suchbegriff)
+                || mitarbeiter.stadt().toLowerCase(Locale.GERMANY).contains(suchbegriff);
+    }
+}

src/main/resources/META-INF/resources/offline.html

@@ -0,0 +1,138 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Keine Verbindung — Dialect Charts</title>
+<style>
+  :root {
+    color-scheme: light dark;
+    --dialect-primary: #e86c00;
+    --dialect-secondary: #f6b93b;
+    --dialect-bg: light-dark(#f4f6f9, #14171f);
+    --dialect-surface: light-dark(#ffffff, #1c2029);
+    --dialect-ink: light-dark(#14171f, #e6eaf0);
+    --dialect-ink-muted: light-dark(#5b6472, #9aa3b2);
+    --dialect-border: light-dark(#e6eaf0, #2b303b);
+    --dialect-radius: 14px;
+    --dialect-shadow-1: light-dark(0 6px 20px rgba(20, 23, 31, 0.08), 0 6px 20px rgba(0, 0, 0, 0.35));
+    --dialect-shadow-2: light-dark(0 1px 2px rgba(20, 23, 31, 0.06), 0 1px 2px rgba(0, 0, 0, 0.3));
+  }
+
+  * { box-sizing: border-box; }
+
+  html, body {
+    height: 100%;
+    margin: 0;
+  }
+
+  body {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 100vh;
+    padding: 24px;
+    background: var(--dialect-bg);
+    color: var(--dialect-ink);
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+  }
+
+  .card {
+    width: 100%;
+    max-width: 420px;
+    background: var(--dialect-surface);
+    border-radius: var(--dialect-radius);
+    box-shadow: var(--dialect-shadow-1), var(--dialect-shadow-2);
+    padding: 40px 32px;
+    text-align: center;
+  }
+
+  .icon {
+    width: 56px;
+    height: 56px;
+    margin: 0 auto 20px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border-radius: 999px;
+    background: color-mix(in srgb, var(--dialect-primary) 14%, transparent);
+    color: var(--dialect-primary);
+  }
+
+  .icon svg {
+    width: 28px;
+    height: 28px;
+  }
+
+  h1 {
+    margin: 0 0 10px;
+    font-size: 1.3rem;
+    font-weight: 600;
+    letter-spacing: -0.01em;
+  }
+
+  p {
+    margin: 0 0 28px;
+    color: var(--dialect-ink-muted);
+    font-size: 0.95rem;
+    line-height: 1.5;
+  }
+
+  button {
+    appearance: none;
+    border: none;
+    border-radius: 8px;
+    padding: 10px 22px;
+    font-size: 0.95rem;
+    font-weight: 600;
+    color: #fff;
+    background: var(--dialect-primary);
+    cursor: pointer;
+  }
+
+  button:hover {
+    background: color-mix(in srgb, var(--dialect-primary) 88%, black);
+  }
+
+  .hint {
+    margin-top: 18px;
+    margin-bottom: 0;
+    font-size: 0.8rem;
+    color: var(--dialect-ink-muted);
+  }
+
+  .hint::before {
+    content: "";
+    display: inline-block;
+    width: 6px;
+    height: 6px;
+    margin-right: 6px;
+    border-radius: 999px;
+    background: var(--dialect-secondary);
+  }
+</style>
+</head>
+<body>
+  <div class="card">
+    <div class="icon">
+      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+        <path d="M1 9a17 17 0 0 1 22 0"></path>
+        <path d="M5 13a11 11 0 0 1 14 0"></path>
+        <path d="M9 17a5 5 0 0 1 6 0"></path>
+        <line x1="1" y1="1" x2="23" y2="23"></line>
+      </svg>
+    </div>
+    <h1>Keine Verbindung</h1>
+    <p>Dialect Charts ist derzeit offline. Bitte prüfen Sie Ihre Internetverbindung und versuchen Sie es erneut.</p>
+    <button id="retry-button">Erneut versuchen</button>
+    <p class="hint">Die Seite wird automatisch neu geladen, sobald die Verbindung wiederhergestellt ist.</p>
+  </div>
+  <script>
+    function reconnect() {
+      location.reload();
+    }
+    document.getElementById('retry-button').addEventListener('click', reconnect);
+    window.addEventListener('online', reconnect);
+  </script>
+</body>
+</html>