feat(quotesdb): show locked banner on /submit when submissions are closed

Check GET /api/status on mount; if submissions_locked is true, hide the
form and show a .submissions-closed-banner instead. Fail-open: on error,
treat as unlocked and display the form normally.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

quotesdb/src/bin/ui/pages/submit.rs

@@ -16,6 +16,10 @@ use yew_router::prelude::*;
 /// Provides a form for creating a new quote with fields for text, author,
 /// source, date, tags, and an optional custom auth code. On success, navigates
 /// directly to the quote detail page and stores the auth code in session storage.
+///
+/// On mount, fetches `GET /api/status` to check whether submissions are locked.
+/// If locked, the form is hidden and a closed-submissions banner is shown instead.
+/// If the status check fails, the form is shown (fail-open behaviour).
 #[function_component(SubmitPage)]
 pub fn submit_page() -> Html {
     let text = use_state(String::new);
@@ -27,8 +31,26 @@ pub fn submit_page() -> Html {
     let submitting = use_state(|| false);
     let error: UseStateHandle<Option<String>> = use_state(|| None);
     let turnstile_token: UseStateHandle<Option<String>> = use_state(|| None);
+    // None = loading, Some(true) = locked, Some(false) = open
+    let submissions_locked: UseStateHandle<Option<bool>> = use_state(|| None);
     let navigator = use_navigator().unwrap();
 
+    // Check submission lock state on mount. Fail-open: show the form on error.
+    {
+        let submissions_locked = submissions_locked.clone();
+        use_effect_with((), move |_| {
+            spawn_local(async move {
+                match api::get_status().await {
+                    Ok(status) => submissions_locked.set(Some(status.submissions_locked)),
+                    Err(_) => {
+                        // Fail-open: show the form if status check fails.
+                        submissions_locked.set(Some(false));
+                    }
+                }
+            });
+        });
+    }
+
     // Register the Turnstile callback in the global window object.
     {
         let turnstile_token = turnstile_token.clone();
@@ -139,11 +161,16 @@ pub fn submit_page() -> Html {
         <div class="page-submit">
             <h1 class="page-submit__title">{ "Submit a Quote" }</h1>
 
-            if let Some(err) = (*error).clone() {
-                <ErrorDisplay message={err} />
-            }
+            if *submissions_locked == Some(true) {
+                <div class="submissions-closed-banner">
+                    <p>{ "Submissions are currently closed." }</p>
+                </div>
+            } else if submissions_locked.is_some() {
+                if let Some(err) = (*error).clone() {
+                    <ErrorDisplay message={err} />
+                }
 
-            <form class="submit-form" onsubmit={onsubmit}>
+                <form class="submit-form" onsubmit={onsubmit}>
                 <div class="submit-form__field">
                     <label class="submit-form__label" for="text">{ "Quote text *" }</label>
                     <textarea
@@ -274,7 +301,8 @@ pub fn submit_page() -> Html {
                         }
                     </button>
                 </div>
-            </form>
+                </form>
+            }
         </div>
     }
 }

quotesdb/src/bin/ui/style.css

@@ -563,6 +563,17 @@ code {
   color: var(--color-text-muted);
 }
 
+/* ── Submissions Closed Banner ─────────────────────────────── */
+.submissions-closed-banner {
+  background: #fefce8;
+  border: 1px solid #fde047;
+  border-radius: var(--radius);
+  padding: 1rem 1.25rem;
+  margin-bottom: 1.5rem;
+  color: #854d0e;
+  font-size: 0.95rem;
+}
+
 /* ── Responsive ────────────────────────────────────────────── */
 @media (max-width: 640px) {
   h1 {