v0.317.0: a second copy counts only on a proven different disk; the no-drive install speaks in words (felhom.eu architecture/16, build A)

Tier-2 and the one-copy notice ask the host agent (POST /disks/same-disk, agent 0.157.0): different +
proven -> made and counted; same disk -> not made (D1); unknown (VM, hidden USB serial) -> made, not
counted, the row says why (D2); a NAS never counts and no longer hides the notice (R-1075). An older
agent keeps the st_dev rule, logged once. D4: a data-folder or media app on a box with no drive is
refused in words with a link to the drives page (R-1068's raw-error half). MinAgent 0.157.0.

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

controller/internal/web/templates/deploy.html

@@ -431,6 +431,24 @@ document.getElementById('deploy-form').addEventListener('submit', async function
             btn.disabled = false;
             return;
         }
+        // D4 (`16` §5): no drive on the box — the sentence, and a way to the drives page.
+        if (!data.ok && data.data && data.data.code === 'needs_drive') {
+            var nd = window.needsDriveNote;
+            if (!nd) {
+                nd = document.createElement('div');
+                nd.className = 'alert alert-warning';
+                btn.parentNode.insertBefore(nd, btn);
+                window.needsDriveNote = nd;
+            }
+            nd.textContent = data.error + ' ';
+            var a = document.createElement('a');
+            a.href = data.data.link || '/storage';
+            a.textContent = '{{T "deploy.meghajtok_megnyitasa"}}';
+            nd.appendChild(a);
+            btn.textContent = '{{T "deploy.telepites_inditasa"}}';
+            btn.disabled = false;
+            return;
+        }
         if (!data.ok) {
             showAlert('{{T "common.hiba_kettospont"}} ' + data.error);
             btn.textContent = '{{T "deploy.telepites_inditasa"}}';