fix: add Enter key handlers to all auth and nickname inputs

Pressing Enter on the username field in login/register or the nickname
field in the join-game prompt now submits the form, matching user
expectations. Also add *.templ to the gitignore allowlist.

features/common/components/shared.templ

@@ -0,0 +1,60 @@
+package components
+
+import "github.com/starfederation/datastar-go/datastar"
+
+templ BackToLobby() {
+	<a class="link text-sm opacity-70" href="/">&larr; Back</a>
+}
+
+templ StealthTitle(class string) {
+	<span class={ class }>
+		<span style="color:#4a2a3a">&#9679;</span>
+		<span style="color:#2a4545">&#9679;</span>
+		<span style="color:#4a2a3a">&#9679;</span>
+		<span style="color:#2a4545">&#9679;</span>
+	</span>
+}
+
+templ NicknamePrompt(returnPath string) {
+	<main class="max-w-sm mx-auto mt-8 text-center" data-signals="{nickname: ''}">
+		<h1 class="text-3xl font-bold">Join Game</h1>
+		<p class="mb-4">Enter your nickname to join the game.</p>
+		<form>
+			<fieldset class="fieldset">
+				<label class="label" for="nickname">Your Nickname</label>
+				<input
+					class="input input-bordered w-full"
+					id="nickname"
+					type="text"
+					placeholder="Enter your nickname"
+					data-bind="nickname"
+					data-on:keydown.key_enter={ datastar.PostSSE("%s", returnPath) }
+					required
+					autofocus
+				/>
+			</fieldset>
+			<button
+				class="btn btn-primary w-full"
+				type="button"
+				data-on:click={ datastar.PostSSE("%s", returnPath) }
+			>
+				Join
+			</button>
+		</form>
+	</main>
+}
+
+templ GameJoinPrompt(loginURL string, registerURL string, gamePath string) {
+	<main class="max-w-sm mx-auto mt-8 text-center">
+		<h1 class="text-3xl font-bold">Join Game</h1>
+		<p class="mb-4">Log in to track your game history, or continue as a guest.</p>
+		<div class="flex flex-col gap-2 my-4">
+			<a class="btn btn-primary w-full" href={ templ.SafeURL(loginURL) }>Login</a>
+			<a class="btn btn-secondary w-full" href={ templ.SafeURL(gamePath + "?guest=1") }>Continue as Guest</a>
+		</div>
+		<p class="text-sm opacity-60">
+			Don't have an account?
+			<a class="link" href={ templ.SafeURL(registerURL) }>Register</a>
+		</p>
+	</main>
+}