sidebar: smooth collapse/expand transition for custom labeled actions

CSS:
- Force min-width:0 on .body-sidebar-bottom so it can shrink to the 50px
  collapsed width instead of refusing to clip past its widest label.
- Animate label max-width and margin-left with the same 0.3s
  cubic-bezier as the sidebar width — labels now slide smoothly
  under their icons on collapse instead of leaving an ellipsized
  letter at the edge.
- Hide v16.17's native .sidebar-bottom-actions row (about + collapse
  icon-buttons) since our labeled .jey-collapse-link replaces it.
- Animate .nav-item padding so it stays in sync with the sidebar
  width transition (Frappe v16 toggles padding 0→8px instantly).

JS:
- Update collapse-link DOM in place (svg href + span text) instead of
  rebuilding innerHTML, so the span keeps its identity and the
  max-width transition plays smoothly across collapse/expand toggles.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

jey_theme/public/css/shared.css

@@ -370,6 +370,15 @@ input.list-header-checkbox:checked::after {
    Sidebar — Full Width button
    ========================================================================== */
 
+/* .body-sidebar-bottom is a flex item of .body-sidebar (column flex).
+   By default min-width:auto resolves to min-content, so it refuses to
+   shrink below the natural width of its widest text — and our buttons'
+   labels poke past the collapsed sidebar's right edge. Force min-width:0
+   so it can match the cross-axis (50px collapsed) and clip properly. */
+.body-sidebar .body-sidebar-bottom {
+        min-width: 0;
+}
+
 .jey-fullwidth-link,
 .jey-theme-switch-link,
 .jey-collapse-link {
@@ -379,6 +388,8 @@ input.list-header-checkbox:checked::after {
         align-items: center;
         cursor: pointer;
         margin-bottom: 8px;
+        width: 100%;
+        overflow: hidden;
 }
 
 .jey-fullwidth-link svg,
@@ -392,9 +403,36 @@ input.list-header-checkbox:checked::after {
 .jey-theme-switch-link span,
 .jey-collapse-link span {
         margin-left: 10px;
+        max-width: 200px;
         overflow: hidden;
         text-overflow: ellipsis;
         white-space: nowrap;
+        transition: max-width 0.3s cubic-bezier(0.4, 0, 0.2, 1),
+                    margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+/* When sidebar is collapsed, animate the label to zero width + zero
+   margin so it smoothly slides under the icon instead of leaving a
+   single ellipsized letter at the edge. */
+.body-sidebar-container:not(.expanded) .jey-fullwidth-link span,
+.body-sidebar-container:not(.expanded) .jey-theme-switch-link span,
+.body-sidebar-container:not(.expanded) .jey-collapse-link span {
+        max-width: 0;
+        margin-left: 0;
+}
+
+/* Hide the v16.17 native bottom row (about + collapse icon-buttons).
+   Our labeled .jey-collapse-link replaces it. */
+.body-sidebar .sidebar-bottom-actions {
+        display: none !important;
+}
+
+/* Frappe v16 toggles .nav-item padding 0→8px instantly between
+   collapsed/expanded, while the sidebar width itself transitions over
+   0.3s — making the user/account button visibly jump 8px. Animate the
+   padding so it stays in sync with the width. */
+.body-sidebar .nav-item {
+        transition: padding 0.3s cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 /* ==========================================================================

jey_theme/public/js/jey_theme.js

@@ -761,9 +761,21 @@
 		var expanded = isExpanded();
 		var iconName = expanded ? "chevrons-left" : "chevrons-right";
 		var label = expanded ? __("Collapse Sidebar") : __("Expand Sidebar");
+
+		var span = link.querySelector("span");
+		var use = link.querySelector("svg use");
+
+		if (!span || !use) {
+			// First render — build the DOM.
 			link.innerHTML =
 				frappe.utils.icon(iconName, "sm", "", "", "text-ink-gray-7 current-color", true) +
 				"<span>" + label + "</span>";
+			return;
+		}
+		// Update in place so the span keeps its identity and the
+		// max-width transition plays smoothly across collapse/expand.
+		use.setAttribute("href", "#icon-" + iconName);
+		span.textContent = label;
 	}
 
 	function addCollapseButton() {