Add a submissions on/off toggle with a mailing-list signup fallback

accepting_submissions: false in the submissions page frontmatter now
swaps the manuscript form for a closed notice and an email signup that
posts to the eec service's new /subscribe endpoint, so visitors can
still join the mailing list while submissions are paused.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

content/submissions/_index.md

@@ -1,6 +1,7 @@
 ---
 title: "Submissions"
 description: "How to submit work to Two Squirrels Press."
+accepting_submissions: false
 ---
 
 We're always glad to look at character-driven speculative fiction and poetry. Markdown is our preferred format, but we'll happily take a `.docx`, `.odt`, or most other common document formats.

layouts/submissions/list.html

@@ -2,6 +2,7 @@
 <h1>{{ .Title }}</h1>
 {{ .Content }}
 
+{{ if ne .Params.accepting_submissions false }}
 <form id="submissions-form" style="margin-top:2rem;">
   <label for="name">Name</label>
   <input type="text" id="name" name="name" required autocomplete="name">
@@ -65,4 +66,55 @@
     });
   })();
 </script>
+{{ else }}
+<p style="margin-top:2rem;">We're not currently accepting submissions, but you can join our mailing list to hear when that changes.</p>
+
+<form id="subscribe-form" style="margin-top:1.5rem;">
+  <label for="email">Email</label>
+  <input type="email" id="email" name="email" required autocomplete="email">
+
+  <div class="field-honeypot" aria-hidden="true">
+    <label for="website">Leave this field empty</label>
+    <input type="text" id="website" name="website" tabindex="-1" autocomplete="off">
+  </div>
+
+  <button type="submit" class="btn">Join the mailing list</button>
+</form>
+<p id="subscribe-status" role="status" style="margin-top:1rem;"></p>
+
+<script>
+  (function () {
+    var form = document.getElementById("subscribe-form");
+    var status = document.getElementById("subscribe-status");
+    form.addEventListener("submit", function (e) {
+      e.preventDefault();
+      var payload = {
+        email: form.email.value,
+        website: form.website.value
+      };
+      var submitBtn = form.querySelector("button[type=submit]");
+      submitBtn.disabled = true;
+      status.textContent = "Signing you up…";
+      fetch("{{ .Site.Params.eec_base_url }}/subscribe", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload)
+      }).then(function (res) {
+        submitBtn.disabled = false;
+        if (res.ok) {
+          form.reset();
+          status.textContent = "Thanks — we'll let you know.";
+          return;
+        }
+        return res.text().then(function (msg) {
+          status.textContent = msg || "Something went wrong signing you up. Try again, or email hello@twosquirrelspress.com directly.";
+        });
+      }).catch(function () {
+        submitBtn.disabled = false;
+        status.textContent = "Something went wrong signing you up. Try again, or email hello@twosquirrelspress.com directly.";
+      });
+    });
+  })();
+</script>
+{{ end }}
 {{ end }}