fix(web): 聊天列表恢复项目符号，收紧定义列表，压思考条间距（BUG-962/963/964）

frontend/src/app/globals.css

@@ -163,6 +163,10 @@
   --space-12: 48px;
   --space-16: 64px;
   --space-24: 96px;
+  /* Gap between the thinking bar and the answer body. Both stacked paths
+     (timeline report and stage-and-answer) must use this token — do not
+     write a second value on either (BUG-964). */
+  --consult-think-answer-gap: var(--space-3);
   --composer-reserve: 124px;
   --ease-out: cubic-bezier(.22, 1, .36, 1);
   /* The personal report's paper surface. Declared here so the dark blocks can
@@ -556,7 +560,7 @@ button:disabled { cursor: default; opacity: .45; }
 .agent-thinking-panel + .message-answer { margin-top: var(--space-2); }
 .message-stage-and-answer {
   display: grid;
-  gap: var(--space-2);
+  gap: var(--consult-think-answer-gap);
 }
 .message-stage-and-answer .agent-thinking-panel,
 .message-stage-and-answer .agent-activity-status {
@@ -1196,7 +1200,7 @@ button:disabled { cursor: default; opacity: .45; }
 }
 .consultation-thinking-report {
   display: grid;
-  gap: var(--space-6);
+  gap: var(--consult-think-answer-gap);
 }
 .consultation-report-analysis {
   min-width: 0;
@@ -1340,6 +1344,15 @@ button:disabled { cursor: default; opacity: .45; }
   margin: var(--space-3) 0 var(--space-5);
   padding-inline-start: 1.35em;
 }
+.message-markdown ul.markdown-list {
+  list-style-type: disc;
+}
+.message-markdown ol.markdown-list {
+  list-style-type: decimal;
+}
+.message-markdown .markdown-list ::marker {
+  color: var(--color-ink-secondary);
+}
 .message-markdown .markdown-list > li {
   padding-block: 0;
   padding-inline-start: 6px;
@@ -2343,7 +2356,7 @@ input:not([type="radio"]):not([type="checkbox"]):not([class^="ant-"]):not([class
 }
 
 .conversation:not(.is-empty):not(.is-rectification) .message-markdown .markdown-list {
-  gap: var(--space-4);
+  gap: var(--space-2);
 }
 
 .conversation:not(.is-empty):not(.is-rectification) .markdown-table {
@@ -2355,6 +2368,10 @@ input:not([type="radio"]):not([type="checkbox"]):not([class^="ant-"]):not([class
   margin: var(--space-8) 0 var(--space-3);
 }
 
+.conversation:not(.is-empty):not(.is-rectification) .message-markdown > *:first-child {
+  margin-top: 0;
+}
+
 .conversation:not(.is-empty):not(.is-rectification) .message-markdown h2 {
   font-size: var(--type-title-lg);
 }