fix(ui): stop sidebar badges from displacing button text

The Chat/History nav buttons centered their icon+label in a region that
shrank when a badge (unread count / mining dot) was present, and the
"has badge" test read the LIVE count — so the text jumped sideways the
moment a count toggled (e.g. a new chat message arrived). Reserve badge
clearance by whether the page CAN show a badge (constant per item), center
in the full button width regardless, and cap the label with symmetric
clearance so a long label still can't run under the corner badge.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/sidebar.h

@@ -679,15 +679,18 @@ inline bool RenderSidebar(NavPage& current, float sidebarWidth, float contentHei
         ImU32 textCol = selected ? Primary() : (pageNeedsUnlock ? OnSurfaceDisabled() : OnSurfaceMedium());
 
         if (showLabels) {
-            // Reserve room for a badge (if this item will draw one) so the
+            // The badge is a fixed top-right corner overlay, so it must NOT move
-            // label centers in the space to the left of it instead of
+            // the icon+label — otherwise the text jumps sideways the moment a live
-            // running underneath the badge circle.
+            // count toggles the badge on/off. Reserve clearance from whether the
-            bool itemHasBadge =
+            // page CAN show a badge (constant per item), never from the current
-                (item.page == NavPage::History && status.unconfirmedTxCount > 0) ||
+            // count, and keep the icon+label centered in the FULL button width so
-                (item.page == NavPage::Mining && status.miningActive) ||
+            // the text position and size stay identical with or without a badge.
-                (item.page == NavPage::Chat && status.chatUnreadCount > 0);
+            bool itemBadgeCapable =
+                item.page == NavPage::History ||
+                item.page == NavPage::Mining ||
+                item.page == NavPage::Chat;
             float badgeReserve = 0.0f;
-            if (itemHasBadge) {
+            if (itemBadgeCapable) {
                 bool dotOnlyReserve = (item.page == NavPage::Mining);
                 float badgeRReserve = dotOnlyReserve ? badgeRadiusDot : badgeRadiusNumber;
                 float badgeInsetXReserve = sde("badge-inset-x", 6.0f);
@@ -697,14 +700,17 @@ inline bool RenderSidebar(NavPage& current, float sidebarWidth, float contentHei
             ImFont* font = selected ? Type().subtitle2() : Type().body2();
             float lblFsz = ScaledFontSize(font);
             float btnW = indMax.x - indMin.x;
-            float maxLabelW = btnW - iconS * 2.0f - iconLabelGap - Layout::spacingXs() * 2 - badgeReserve;
+            // Clearance is symmetric (2x) because the group stays centered in the
+            // full width: reserving on both sides keeps the label's right edge clear
+            // of the right-side corner badge without shifting the center off-axis.
+            float maxLabelW = btnW - iconS * 2.0f - iconLabelGap - Layout::spacingXs() * 2 - badgeReserve * 2.0f;
             ImVec2 labelSz = font->CalcTextSizeA(lblFsz, 1000.0f, 0.0f, NavLabel(item));
             if (labelSz.x > maxLabelW && maxLabelW > 0) {
                 lblFsz *= maxLabelW / labelSz.x;
                 labelSz = font->CalcTextSizeA(lblFsz, 1000.0f, 0.0f, NavLabel(item));
             }
             float totalW = iconS * 2.0f + iconLabelGap + labelSz.x;
-            float btnCX = (indMin.x + indMax.x - badgeReserve) * 0.5f;
+            float btnCX = (indMin.x + indMax.x) * 0.5f;
             float startX = btnCX - totalW * 0.5f;
 
             DrawNavIcon(dl, item.page, startX + iconS, iconCY, iconS, textCol);