feat: add input placeholders to login form

templates/login.gohtml

@@ -17,6 +17,7 @@
           type="text"
           autocomplete="username"
           spellcheck="false"
+          placeholder="you@example.com"
           required
           value="{{.Username}}"
           class="h-10 w-full bg-background-surface px-3 text-foreground outline-none transition focus:ring-1 focus:ring-accent rounded-none!"
@@ -33,6 +34,7 @@
             name="password"
             type="password"
             autocomplete="current-password"
+            placeholder="Enter your password"
             required
             class="min-w-0 flex-1 bg-transparent px-3 text-foreground outline-none rounded-none!"
           />