KAN-51: add isolated Tauri macOS app scaffold

native/ui/index.html

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+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <meta name="color-scheme" content="light dark" />
+        <title>KanbanGit</title>
+        <link rel="stylesheet" href="./styles.css" />
+        <script type="module" src="./main.js"></script>
+    </head>
+    <body>
+        <main>
+            <img class="brand" src="./mark.svg" alt="" width="48" height="48" />
+            <p class="eyebrow" data-i18n="appName"></p>
+            <h1 data-i18n="title"></h1>
+            <p class="description" data-i18n="description"></p>
+            <a class="open-workspace" href="https://kanbangit.de/" data-i18n="openWorkspace"></a>
+            <p class="server">kanbangit.de</p>
+            <label class="appearance">
+                <span data-i18n="appearance"></span>
+                <select id="appearance">
+                    <option value="system" data-i18n="system"></option>
+                    <option value="light" data-i18n="light"></option>
+                    <option value="dark" data-i18n="dark"></option>
+                </select>
+            </label>
+        </main>
+    </body>
+</html>

native/ui/locales/en.js

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+export const en = {
+    appName: 'KanbanGit',
+    title: 'Your workspace, one click away.',
+    description: 'Open your projects and keep work moving.',
+    openWorkspace: 'Open workspace',
+    appearance: 'Appearance',
+    system: 'System',
+    light: 'Light',
+    dark: 'Dark',
+};

native/ui/main.js

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+import { en } from './locales/en.js';
+
+for (const element of document.querySelectorAll('[data-i18n]')) {
+    element.textContent = en[element.dataset.i18n];
+}
+
+document.querySelector('#appearance').addEventListener('change', (event) => {
+    document.documentElement.dataset.appearance = event.target.value;
+});

native/ui/mark.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 64 64">
+    <rect width="64" height="64" rx="12" fill="#22c55e" />
+    <g fill="none" stroke="#004b1e" stroke-width="3" stroke-linecap="round" stroke-linejoin="round">
+        <rect x="16" y="16" width="32" height="32" rx="3" />
+        <path d="M27 16v32M37 16v32" />
+    </g>
+</svg>

native/ui/styles.css

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+:root {
+    --surface: #f7f9fb;
+    --foreground: #191c1e;
+    --muted: #505f76;
+    --primary: #006e2f;
+    --border: #bccbb9;
+    --control: #ffffff;
+    font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+    color-scheme: light dark;
+    color: var(--foreground);
+    background: var(--surface);
+    font-synthesis: none;
+}
+
+:root[data-appearance='light'] {
+    color-scheme: light;
+}
+
+:root[data-appearance='dark'] {
+    color-scheme: dark;
+    --surface: #0f172a;
+    --foreground: #f8fafc;
+    --muted: #b7c8e1;
+    --primary: #4ae176;
+    --border: #334155;
+    --control: #1e293b;
+}
+
+@media (prefers-color-scheme: dark) {
+    :root:not([data-appearance='light']) {
+        --surface: #0f172a;
+        --foreground: #f8fafc;
+        --muted: #b7c8e1;
+        --primary: #4ae176;
+        --border: #334155;
+        --control: #1e293b;
+    }
+}
+
+* {
+    box-sizing: border-box;
+}
+
+body {
+    margin: 0;
+    min-height: 100vh;
+    display: grid;
+    place-items: center;
+    padding: 32px;
+}
+
+main {
+    width: min(100%, 380px);
+}
+
+.brand {
+    display: block;
+    margin-bottom: 24px;
+}
+
+.eyebrow {
+    font-size: 11px;
+    font-weight: 700;
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+    color: var(--primary);
+}
+
+h1 {
+    margin: 12px 0;
+    font-size: 28px;
+    font-weight: 600;
+    line-height: 1.2;
+    letter-spacing: -0.02em;
+}
+
+.description,
+.server,
+.appearance {
+    color: var(--muted);
+    font-size: 14px;
+    line-height: 1.5;
+}
+
+.open-workspace {
+    display: block;
+    margin-top: 28px;
+    padding: 12px 20px;
+    border-radius: 4px;
+    color: #004b1e;
+    background: #22c55e;
+    text-align: center;
+    text-decoration: none;
+    font-size: 14px;
+    font-weight: 600;
+}
+
+.open-workspace:hover {
+    background: #4ae176;
+}
+
+:focus-visible {
+    outline: 2px solid var(--primary);
+    outline-offset: 4px;
+}
+
+.server {
+    text-align: center;
+    font-size: 12px;
+}
+
+.appearance {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-top: 32px;
+}
+
+select {
+    min-height: 36px;
+    padding: 4px 10px;
+    font: inherit;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    color: inherit;
+    background: var(--control);
+}