Fix chpasswd path on NixOS, add password toggle/hints/validation in change-password form

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/de03873d-5cdb-4929-bd4a-4d306916b525

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

app/sovran_systemsos_web/static/css/security.css

@@ -40,3 +40,68 @@
 .security-inline-link:hover {
   background-color: rgba(180, 100, 0, 0.22);
 }
+
+/* ── System change-password form extras ──────────────────────────── */
+
+.sys-chpw-header {
+  margin-bottom: 14px;
+}
+
+.sys-chpw-title {
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin-bottom: 4px;
+}
+
+.sys-chpw-desc {
+  font-size: 0.82rem;
+  color: var(--text-secondary);
+  line-height: 1.5;
+}
+
+.pw-input-wrap {
+  position: relative;
+  display: flex;
+  align-items: center;
+}
+
+.pw-input-wrap .matrix-form-input {
+  padding-right: 2.4rem;
+  width: 100%;
+}
+
+.pw-toggle-btn {
+  position: absolute;
+  right: 6px;
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 1rem;
+  padding: 2px 4px;
+  line-height: 1;
+  color: var(--text-secondary);
+  opacity: 0.75;
+  transition: opacity 0.15s;
+}
+
+.pw-toggle-btn:hover {
+  opacity: 1;
+}
+
+.pw-hint {
+  font-size: 0.76rem;
+  color: var(--text-secondary);
+  margin-top: 4px;
+}
+
+.pw-credentials-note {
+  font-size: 0.78rem;
+  color: #c97a00;
+  background-color: rgba(180, 100, 0, 0.10);
+  border-left: 2px solid #c97a00;
+  border-radius: 4px;
+  padding: 7px 10px;
+  margin-bottom: 12px;
+  line-height: 1.5;
+}

app/sovran_systemsos_web/static/js/service-detail.js

@@ -547,10 +547,22 @@ function openMatrixChangePasswordModal(unit, name, icon) {
 function openSystemChangePasswordModal(unit, name, icon) {
   if (!$credsBody) return;
   $credsBody.innerHTML =
+    '<div class="sys-chpw-header">' +
+      '<div class="sys-chpw-title">🔑 Change \'free\' Account Password</div>' +
+      '<div class="sys-chpw-desc">This updates the system login password for the <strong>free</strong> user account on this device.</div>' +
+    '</div>' +
     '<div class="matrix-form-group"><label class="matrix-form-label" for="sys-chpw-new">New Password</label>' +
-    '<input class="matrix-form-input" type="password" id="sys-chpw-new" placeholder="New strong password" autocomplete="new-password"></div>' +
+    '<div class="pw-input-wrap">' +
+    '<input class="matrix-form-input" type="password" id="sys-chpw-new" placeholder="New strong password" autocomplete="new-password">' +
+    '<button type="button" class="pw-toggle-btn" id="sys-chpw-new-toggle" aria-label="Toggle password visibility">👁</button>' +
+    '</div>' +
+    '<div class="pw-hint">Password must be at least 8 characters.</div></div>' +
     '<div class="matrix-form-group"><label class="matrix-form-label" for="sys-chpw-confirm">Confirm Password</label>' +
-    '<input class="matrix-form-input" type="password" id="sys-chpw-confirm" placeholder="Confirm new password" autocomplete="new-password"></div>' +
+    '<div class="pw-input-wrap">' +
+    '<input class="matrix-form-input" type="password" id="sys-chpw-confirm" placeholder="Confirm new password" autocomplete="new-password">' +
+    '<button type="button" class="pw-toggle-btn" id="sys-chpw-confirm-toggle" aria-label="Toggle password visibility">👁</button>' +
+    '</div></div>' +
+    '<div class="pw-credentials-note">⚠ After changing, your updated password will appear in the System Passwords credentials tile. Make sure to remember it.</div>' +
     '<div class="matrix-form-actions">' +
     '<button class="matrix-form-back" id="sys-chpw-back-btn">← Back</button>' +
     '<button class="matrix-form-submit" id="sys-chpw-submit-btn">Change Password</button>' +
@@ -561,6 +573,20 @@ function openSystemChangePasswordModal(unit, name, icon) {
     openServiceDetailModal(unit, name, icon);
   });
 
+  document.getElementById("sys-chpw-new-toggle").addEventListener("click", function() {
+    var inp = document.getElementById("sys-chpw-new");
+    var isHidden = inp.type === "password";
+    inp.type = isHidden ? "text" : "password";
+    this.textContent = isHidden ? "👁‍🗨" : "👁";
+  });
+
+  document.getElementById("sys-chpw-confirm-toggle").addEventListener("click", function() {
+    var inp = document.getElementById("sys-chpw-confirm");
+    var isHidden = inp.type === "password";
+    inp.type = isHidden ? "text" : "password";
+    this.textContent = isHidden ? "👁‍🗨" : "👁";
+  });
+
   document.getElementById("sys-chpw-submit-btn").addEventListener("click", async function() {
     var submitBtn = document.getElementById("sys-chpw-submit-btn");
     var resultEl = document.getElementById("sys-chpw-result");
@@ -573,6 +599,18 @@ function openSystemChangePasswordModal(unit, name, icon) {
       return;
     }
 
+    if (newPassword.length < 8) {
+      resultEl.className = "matrix-form-result error";
+      resultEl.textContent = "Password must be at least 8 characters.";
+      return;
+    }
+
+    if (newPassword !== confirmPassword) {
+      resultEl.className = "matrix-form-result error";
+      resultEl.textContent = "Passwords do not match.";
+      return;
+    }
+
     submitBtn.disabled = true;
     submitBtn.textContent = "Changing…";
     resultEl.className = "matrix-form-result";