fixes

another_prompt

@@ -37,3 +37,6 @@ Système de service mails aussi pour les comptes (optionel) pour recovery passwo
   when uploading new pfp, actually it uploading the file without click needing into save button.
   the normal flow that i want is. uploading , updating the preview, cancel button: keep the current one, re-freshing the previw.
   save -> saving and pushing the pfp to the api
+
+--- bugs:
+when disabling attachment sendability: the text "Message" placeholder nto the composer chat are too tigh to the left border, make a fallback padding when no attachment button

frontend/src/components/SharePage.tsx

@@ -35,7 +35,32 @@ export function SharePage({ publicId }: { publicId: string }) {
         </div>
       </header>
       <main className="mx-auto w-full max-w-3xl space-y-5 px-4 py-6">
-        {error && <p className="rounded-2xl bg-red-50 px-4 py-3 text-sm text-red-600 dark:bg-red-950/40 dark:text-red-400">{error}</p>}
+        {error && (
+          <div className="mx-auto max-w-md py-10 text-center">
+            <div className="rounded-[2rem] border border-stone-200/70 bg-white p-8 shadow-xl dark:border-zinc-800 dark:bg-zinc-900">
+              <span className="mx-auto mb-4 grid h-16 w-16 place-items-center rounded-full bg-stone-200/70 text-stone-500 dark:bg-zinc-800 dark:text-zinc-400">
+                <CloudOff size={28} />
+              </span>
+              <h1 className="font-serif text-2xl font-bold tracking-tight">This shared chat is gone</h1>
+              <p className="mt-2 text-sm opacity-70">
+                The link is invalid, expired, or the author unshared it.
+                {error && error.toLowerCase() !== "not found" ? ` (${error})` : ""}
+              </p>
+              <div className="mt-6 flex flex-col justify-center gap-2 sm:flex-row">
+                <a href="/" className="rounded-full bg-accent-600 px-5 py-2.5 text-sm font-medium text-white transition hover:bg-accent-500 dark:bg-accent-500 dark:text-zinc-950 dark:hover:bg-accent-400">
+                  Open KisAssistant
+                </a>
+                <button
+                  onClick={() => window.history.length > 1 ? window.history.back() : (window.location.href = "/")}
+                  className="rounded-full border border-stone-200 px-5 py-2.5 text-sm font-medium transition hover:bg-stone-100 dark:border-zinc-700 dark:hover:bg-zinc-800"
+                >
+                  Go back
+                </button>
+              </div>
+            </div>
+            <FlowerMark size={28} dynamic={false} className="mx-auto mt-6 opacity-40" />
+          </div>
+        )}
         {!chat && !error && <p className="py-16 text-center text-sm opacity-60">Loading shared chat…</p>}
         {chat?.messages.map((m, i) => (
           <div key={i} className="flex gap-3">