Fix security reset UX: full-screen overlay, CSS class bug, and auto-reconnect

- Add security-reset-overlay HTML element to index.html that shows immediately
  when the user confirms "Erase & Reset", before the synchronous API call runs
- Add .security-reset-overlay CSS to security.css (reuses reboot-card styles,
  adds fade-in animation, z-index 1000 to sit above all other content)
- Fix reboot overlay class bug: classList.add("open") → classList.add("visible")
  so the overlay actually renders per the .reboot-overlay.visible CSS rule
- Show overlay step text "Erasing data and resetting credentials…" during wipe,
  update to "Reset complete. Rebooting now…" when API returns
- Call waitForServerReboot() (globally defined in update.js) after reset so the
  page auto-reloads when the system comes back online
- Hide the security-reset-overlay and re-enable the button on error

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/185d0b41-d54d-4ea2-93d6-bfb7c15b8aed

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

app/sovran_systemsos_web/static/js/security.js

@@ -119,12 +119,22 @@ function openSecurityModal() {
         if (!eraseInput || eraseInput.value.trim() !== "ERASE") return;
         resetConfirmBtn.disabled = true;
         resetConfirmBtn.textContent = "Erasing\u2026";
+
+        // Show the full-screen blocking overlay immediately so the user knows
+        // the wipe is in progress even while the API call runs synchronously.
+        var $secResetOverlay = document.getElementById("security-reset-overlay");
+        var $secResetStep = document.getElementById("security-reset-overlay-step");
+        if ($secResetOverlay) $secResetOverlay.classList.add("visible");
+
         if (resetStatus) { resetStatus.textContent = "Running security reset\u2026"; resetStatus.className = "security-status-msg security-status-info"; }
         try {
           await apiFetch("/api/security/reset", { method: "POST" });
+          if ($secResetStep) $secResetStep.textContent = "Reset complete. Rebooting now\u2026";
           if (resetStatus) { resetStatus.textContent = "\u2713 Reset complete. Rebooting\u2026"; resetStatus.className = "security-status-msg security-status-ok"; }
-          if ($rebootOverlay) $rebootOverlay.classList.add("open");
+          if ($rebootOverlay) $rebootOverlay.classList.add("visible");
+          setTimeout(waitForServerReboot, REBOOT_CHECK_INTERVAL);
         } catch (err) {
+          if ($secResetOverlay) $secResetOverlay.classList.remove("visible");
           if (resetStatus) { resetStatus.textContent = "\u2717 Error: " + (err.message || "Reset failed."); resetStatus.className = "security-status-msg security-status-error"; }
           resetConfirmBtn.disabled = false;
           resetConfirmBtn.textContent = "Erase & Reset";