fix: use correct Datastar keydown event syntax

Replace invalid .key_enter and .enter modifiers with evt.key === 'Enter'
guard in the expression, per Datastar docs. Also fix __stop and __throttle
modifier syntax to use double underscores.

features/auth/pages/login.templ

@@ -20,7 +20,7 @@ templ LoginPage() {
 						type="text"
 						placeholder="Enter your username"
 					data-bind="username"
-					data-on:keydown.key_enter={ datastar.PostSSE("/auth/login") }
+					data-on:keydown={ "evt.key === 'Enter' && " + datastar.PostSSE("/auth/login") }
 					autofocus
 				/>
 					<label class="label" for="password">Password</label>
@@ -30,7 +30,7 @@ templ LoginPage() {
 						type="password"
 						placeholder="Enter your password"
 						data-bind="password"
-						data-on:keydown.key_enter={ datastar.PostSSE("/auth/login") }
+						data-on:keydown={ "evt.key === 'Enter' && " + datastar.PostSSE("/auth/login") }
 					/>
 				</fieldset>
 				<button