v3: button styling consistency pass

src/App.css

@@ -280,7 +280,7 @@
 }
 
 /* ── Mode toggle — segmented control ── */
-.dump-mode-toggle {
+.visibility-toggle {
   display: flex;
   background: var(--color-bg);
   border: 1.5px solid var(--color-border);
@@ -289,7 +289,7 @@
   gap: 2px;
 }
 
-.dump-mode-toggle button {
+.visibility-toggle button {
   flex: 1;
   padding: 0.3rem 0.9rem;
   border-radius: 6px;
@@ -303,12 +303,12 @@
   white-space: nowrap;
 }
 
-.dump-mode-toggle button.active {
+.visibility-toggle button.active {
   background: var(--color-accent);
   color: var(--color-on-accent);
 }
 
-.dump-mode-toggle button:not(.active):hover {
+.visibility-toggle button:not(.active):hover {
   background: color-mix(in srgb, var(--color-accent) 12%, transparent);
 }
 
@@ -1059,7 +1059,7 @@ body.has-player .fab-new {
   font-weight: 600;
 }
 
-.profile-header .logout-btn {
+.profile-header .btn-border {
   margin-top: 0.5rem;
 }
 
@@ -1091,7 +1091,7 @@ body.has-player .fab-new {
   margin-top: 0.5rem;
   align-items: center;
 }
-.profile-own-actions .logout-btn {
+.profile-own-actions .btn-border {
   margin-top: 0;
 }
 .invite-generate {
@@ -1189,7 +1189,10 @@ body.has-player .fab-new {
   color: var(--color-accent);
 }
 
-.logout-btn {
+/* ── Border-tinted buttons ── */
+.btn-border-danger,
+.btn-border-success,
+.btn-border {
   padding: 0.3rem 0.9rem;
   border: 1.5px solid var(--color-border);
   border-radius: 6px;
@@ -1197,14 +1200,22 @@ body.has-player .fab-new {
   color: var(--color-text-muted);
   font-size: 0.85rem;
   cursor: pointer;
-  transition: border-color 0.15s, color 0.15s;
+  transition: border-color 0.15s, color 0.15s, background 0.15s;
 }
 
-.logout-btn:hover {
+.btn-border-danger:hover,
+.btn-border-danger.active,
+.btn-border:hover {
   border-color: var(--color-danger);
   color: var(--color-danger);
 }
 
+.btn-border-success:hover,
+.btn-border-success.active {
+  border-color: var(--color-success);
+  color: var(--color-success);
+}
+
 /* ── ErrorCard ── */
 .error-card-wrap {
   display: flex;