Restyle the web UI in a light theme, step 2: remaining pages

- News: show the list and the article detail side by side; the drawer
  becomes a persistent detail panel with a revision picker and +/- line
  counts.
- Crawler console: one card per source instead of tabs, plus a merged
  live log panel filterable by source and level.
- Chat: segmented Chat / CONTEXT.md switch, message cards with times,
  bordered tool-call rows and a context usage bar.
- Login, Skills and Settings move to the panel style; diff and highlight
  colors follow the new palette. The market K-line area stays dark.

web/types/components.d.ts

@@ -12,7 +12,6 @@ export {}
 declare module 'vue' {
   export interface GlobalComponents {
     ElAlert: typeof import('element-plus/es')['ElAlert']
-    ElBadge: typeof import('element-plus/es')['ElBadge']
     ElButton: typeof import('element-plus/es')['ElButton']
     ElCard: typeof import('element-plus/es')['ElCard']
     ElCheckbox: typeof import('element-plus/es')['ElCheckbox']
@@ -46,6 +45,7 @@ declare module 'vue' {
     ElRadioButton: typeof import('element-plus/es')['ElRadioButton']
     ElRadioGroup: typeof import('element-plus/es')['ElRadioGroup']
     ElScrollbar: typeof import('element-plus/es')['ElScrollbar']
+    ElSegmented: typeof import('element-plus/es')['ElSegmented']
     ElSelect: typeof import('element-plus/es')['ElSelect']
     ElSelectV2: typeof import('element-plus/es')['ElSelectV2']
     ElSwitch: typeof import('element-plus/es')['ElSwitch']