fix(mobile): flex-center pill buttons and fix learning task card layout

- learning: task-list/snippet-list use column direction (row squeeze caused
  one-char-per-line vertical text in today-task cards)
- learning/profile: fold-toggle flex-centered
- login: code-button flex-centered
- practice: transcript-toggle / bubble-action / style-chip flex-centered
- questions: filter-chip flex-centered
- sop: modal-close flex-centered with 32px hit area
- web-ai: bubble-action flex-centered

mobile-uni/src/pages/auth/login/index.vue

@@ -461,6 +461,9 @@ onShow(() => {
 }
 
 .code-button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
   width: 100%;
   min-height: 56px;
   padding: 0 4px;
@@ -470,7 +473,7 @@ onShow(() => {
   color: #e60012;
   font-size: 12px;
   font-weight: 700;
-  line-height: 1.3;
+  line-height: 1;
   white-space: nowrap;
   box-shadow: 0 6px 14px rgba(242, 11, 26, 0.06);
 }

mobile-uni/src/pages/user/learning/index.vue

@@ -1055,7 +1055,13 @@ onUnload(invalidateRequests);
 }
 
 .task-list,
-.snippet-list,
+.snippet-list {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  margin-top: 14px;
+}
+
 .action-list {
   display: flex;
   gap: 10px;
@@ -1209,17 +1215,19 @@ onUnload(invalidateRequests);
 }
 
 .fold-toggle {
-  display: block;
+  display: flex;
+  align-items: center;
+  justify-content: center;
   width: 100%;
+  min-height: 36px;
   margin: 10px 0 0;
-  padding: 8px 0;
+  padding: 0;
   border: none;
   border-top: 1px dashed #eceff2;
   background: transparent;
   color: #6b7480;
   font-size: 13px;
-  text-align: center;
+  line-height: 1.3;
-  line-height: 1.5;
 }
 
 .fold-toggle::after {

mobile-uni/src/pages/user/practice/index.vue

@@ -2763,15 +2763,19 @@ onUnload(() => {
 }
 
 .transcript-toggle {
+  display: flex;
+  align-items: center;
+  justify-content: center;
   flex-shrink: 0;
+  min-height: 28px;
   margin: 0;
-  padding: 4px 12px;
+  padding: 0 12px;
   border: none;
   border-radius: 8px;
   background: rgba(20, 24, 31, 0.06);
   color: #6b7480;
   font-size: 12px;
-  line-height: 1.5;
+  line-height: 1;
 }
 
 .bubble-actions {
@@ -2783,14 +2787,18 @@ onUnload(() => {
 }
 
 .bubble-action {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 28px;
   margin: 0;
-  padding: 4px 12px;
+  padding: 0 12px;
   border: 1px solid #d9e4f0;
   border-radius: 999px;
   background: #ffffff;
   color: #38424e;
   font-size: 12px;
-  line-height: 1.5;
+  line-height: 1;
 }
 
 .help-ref-list {
@@ -2832,15 +2840,19 @@ onUnload(() => {
 }
 
 .style-chip-row .chip {
+  display: flex;
+  align-items: center;
+  justify-content: center;
   flex-shrink: 0;
+  min-height: 30px;
   margin: 0;
-  padding: 5px 12px;
+  padding: 0 12px;
   border: 1px solid #cddcec;
   border-radius: 999px;
   background: #ffffff;
   color: #1f5c9d;
   font-size: 13px;
-  line-height: 1.4;
+  line-height: 1;
 }
 
 .style-chip-row + .chat-composer-wrap,

mobile-uni/src/pages/user/profile/index.vue

@@ -920,17 +920,19 @@ onShow(() => {
 }
 
 .fold-toggle {
-  display: block;
+  display: flex;
+  align-items: center;
+  justify-content: center;
   width: 100%;
+  min-height: 36px;
   margin: 10px 0 0;
-  padding: 8px 0;
+  padding: 0;
   border: none;
   border-top: 1px dashed #eceff2;
   background: transparent;
   color: #6b7480;
   font-size: 13px;
-  text-align: center;
+  line-height: 1.3;
-  line-height: 1.5;
 }
 
 .fold-toggle::after {

mobile-uni/src/pages/user/questions/index.vue

@@ -127,7 +127,7 @@ onShow(() => { resetPageScroll(); void load(); });
 .points-link { display:block; min-height:40px; margin:8px 0 0 auto; background:transparent; color:var(--knowledge); font-size:13px; font-weight:800; }
 .tab-scroll { margin-top: 18px; }
 .tab-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
-.filter-chip { width: 100%; min-width: 0; min-height: 40px; padding: 5px 4px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); font-size: 13px; line-height: 1.25; }
+.filter-chip { display: flex; align-items: center; justify-content: center; width: 100%; min-width: 0; min-height: 40px; padding: 0 4px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); font-size: 13px; line-height: 1.25; }
 .filter-chip.active { border-color: #f2a7ad; background: var(--employee-primary-soft); color: var(--brand); font-weight: 900; }
 .status-message, .empty { display: grid; gap: 6px; margin-top: 16px; padding: 16px; }
 .status-message { border-radius: 12px; background: #fff0f1; color: #a9000d; }

mobile-uni/src/pages/user/sop/index.vue

@@ -1357,6 +1357,9 @@ onUnload(() => {
 }
 
 .modal-close {
+  display: flex;
+  align-items: center;
+  justify-content: center;
   background: transparent;
   border: none;
   font-size: 24px;
@@ -1364,8 +1367,9 @@ onUnload(() => {
   cursor: pointer;
   padding: 0;
   line-height: 1;
-  width: auto;
+  width: 32px;
-  min-height: auto;
+  height: 32px;
+  min-height: 32px;
 }
 
 .modal-body {

mobile-uni/src/pages/user/web-ai/index.vue

@@ -603,14 +603,18 @@ onUnload(() => {
 }
 
 .bubble-action {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 28px;
   margin: 0;
-  padding: 4px 12px;
+  padding: 0 12px;
   border: 1px solid #e3e6ea;
   border-radius: 999px;
   background: #f7f8fa;
   color: #38424e;
   font-size: 12px;
-  line-height: 1.5;
+  line-height: 1;
 }
 
 .bubble-action.primary {