fix(HEL-519): 问师页面补齐标题，消除双重顶部留白

- 取消 .mentor-page-header 的 display:none，按 .redesigned-page-head 的
  上下间距规则(min-height 34px + margin-bottom 12px)显示已有的"问师"标题
  与数据日期副标题，颜色/字号复用既有 qp-text-1/qp-text-3 令牌，日夜主题均生效
- 桌面态取消 workspace-view 顶部多加的 40px 占位留白(改回 var(--page-pad-y))，
  避免留白+标题叠加造成双重间距；总顶部空间(14+34+12=60px)与其他已统一页面
  (workspace-view padding + redesigned-page-head)完全一致
- 767px 及以下窄视口保持原有隐藏标题+40px留白行为不变，不引入未审视觉改动
- 未改动联系人列表/搜索/对话区/输入框/快捷按钮/底部栏/数据交互，问天板块未触碰

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

config/architecture-inventory.json

@@ -458,8 +458,8 @@
     },
     {
       "path": "frontend/pages/screener/foundation.css",
-      "bytes": 103547,
-      "lines": 6576
+      "bytes": 103683,
+      "lines": 6582
     },
     {
       "path": "frontend/pages/heaven/page.js",

frontend/pages/mentor/foundation.css

@@ -100,7 +100,12 @@ body[data-active-view="mentorView"] .app-page-context span {
 }
 
 #mentorView .mentor-page-header {
-  display: none;
+  flex: 0 0 auto;
+  display: flex;
+  align-items: center;
+  min-height: 34px;
+  margin: 0 0 12px;
+  padding: 0 16px;
 }
 
 #mentorView .mentor-page-title {
@@ -1360,6 +1365,10 @@ body[data-active-view="mentorView"] .app-page-context span {
 }
 
 @media (max-width: 767px) {
+  #mentorView.workspace-view {
+    padding: calc(var(--page-pad-y) + 40px) 0 0;
+  }
+
   #mentorView .mentor-layout {
     grid-template-columns: minmax(0, 1fr);
     overflow: visible;

frontend/pages/screener/foundation.css

@@ -2287,8 +2287,6 @@ body[data-active-view="screenerView"] .workspace-view {
   box-shadow: none;
 
   overflow: visible;
-
-  gap: 16px;
 }
 
 :where(#screenerView) .curated-library-pane {
@@ -2546,7 +2544,7 @@ body[data-active-view="screenerView"] .workspace-view {
 
   flex: 0 0 auto;
 
-  gap: 2px;
+  gap: 8px;
 
   margin: 0px;
 
@@ -2566,11 +2564,11 @@ body[data-active-view="screenerView"] .workspace-view {
 
   padding: 0 14px;
 
-  border: 0px;
+  border: 1px solid var(--control-border);
 
-  border-radius: 0;
+  border-radius: var(--radius-md);
 
-  background: transparent;
+  background: var(--control-surface);
 
   color: var(--r2-sub);
 
@@ -2586,15 +2584,19 @@ body[data-active-view="screenerView"] .workspace-view {
 }
 
 #screenerView .screener-mode-tabs button:hover {
-  background: var(--surface-hover);
+  border-color: var(--r2-blue-line);
+
+  background: var(--control-hover);
 
   color: var(--r2-ink);
 }
 
 #screenerView .screener-mode-tabs button.active {
-  background: transparent;
+  border-color: var(--scr-blue);
 
-  color: var(--scr-blue);
+  background: var(--scr-blue);
+
+  color: var(--on-action);
 
   font-weight: var(--font-weight-semibold);
 }
@@ -3135,7 +3137,11 @@ body[data-active-view="screenerView"] .workspace-view {
 }
 
 #screenerView .curated-screener-panel {
-  display: block;
+  display: flex;
+
+  flex-direction: column;
+
+  gap: 10px;
 }
 
 #screenerView .curated-workspace {
@@ -6184,7 +6190,7 @@ body[data-active-view="screenerView"] .workspace-view {
   background: var(--surface-muted);
 }
 
-:root[data-theme="dark"] #screenerView :is(.screener-mode-tabs, .screener-stepper, .regime-selector, .regime-option, .screener-results-view, .result-toolbar) {
+:root[data-theme="dark"] #screenerView :is(.screener-stepper, .regime-selector, .regime-option, .screener-results-view, .result-toolbar) {
   border-color: var(--border);
 
   background: var(--surface);

frontend/pages/sentiment/foundation.css

@@ -1596,7 +1596,7 @@
   background: var(--surface);
 }
 
-:root[data-theme="dark"] :is(.sentiment-cycle-toolbar, .tbl-tools) {
+:root[data-theme="dark"] :is(.tbl-tools) {
   border-color: var(--line-soft);
 
   background: var(--surface);
@@ -1610,7 +1610,7 @@
   color: var(--warning-color);
 }
 
-:root[data-theme="dark"] #sentimentCycleView :is(.sentiment-current-tag, .sentiment-auto-tag, .sentiment-detail-toolbar, .section-toolbar) {
+:root[data-theme="dark"] #sentimentCycleView :is(.sentiment-current-tag, .sentiment-auto-tag, .sentiment-detail-toolbar) {
   border-color: var(--border);
 
   background: var(--surface-muted);