feat: add home and team editor templates

src/Views/home.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+use BattleForge\Http\Escape;
+
+/** @var string $csrf Provided by the front controller. */
+?><?php
+render_layout(static function () use ($csrf): void {
+    $e = static fn (string $v): string => Escape::html($v);
+    $a = static fn (string $v): string => Escape::attr($v);
+    ?>
+    <h1>BattleForge</h1>
+    <p><a href="<?= $a('/scenarios/new/edit/team') ?>">New scenario</a></p>
+    <h2>Recent scenarios</h2>
+    <div id="recent"><p class="bf-empty">No saved scenarios yet.</p></div>
+    <script type="module" src="<?= $a('/js/storage.js') ?>"></script>
+    <?php
+}, $csrf, 'BattleForge');