feat(settings): replicate the WorkBuddy about and help panels without external jumps (TODO 19)

Recover the shared WorkBuddy 5.8.3 HelpFeedbackPanel stylesheet through REA (18 module rules plus scoped light/dark tokens) and rebuild the 关于 and 获取帮助 pages: 638x620 panels, 638x108 two-row cards, 82x32/102x32 actions, the 638x226 follow card with three 120x120 QR frames and the 638x44 footer.

Keep the user's no-jump requirement explicit: every external entry (检查更新, 前往官网, 填写反馈, 查看文档, 隐私政策, 服务协议) keeps the original wording and geometry but is aria-disabled with a 暂未接入/尚未配置 tooltip and performs no navigation; the WorkBuddy account QR codes become same-size 尚未配置 placeholders. The version line reads the real appInfo version.

Also fix a CSS bundling regression found while wiring this page: the shared general-settings stylesheet was inlined three times and overrode the personalization long-card padding, collapsing the 598x160 previews to 614 wide. Remove the duplicate import and raise the personalization padding specificity.

Verify with scripts/verify-about-help-settings.cjs (15 assertions: both pages, geometry, real version, disabled jumpless actions, no anchors, dark surfaces) and keep all existing settings regressions green.

scripts/rea/probe-todo19-about-dark.json

@@ -0,0 +1,14 @@
+{
+  "include_fonts": false,
+  "include_message_content": false,
+  "track_selectors": [
+    ".settings-navigation__item--active",
+    ".settings-navigation__group--about",
+    ".settings-modal__panel",
+    ".help-feedback-panel"
+  ],
+  "actions": [
+    { "kind": "click", "step_id": "open-about-by-observed-nav-index-14-in-dark-theme", "selector": ".settings-navigation__item", "index": 14, "frames": 1 },
+    { "kind": "wait", "step_id": "verify-about-dark-page-stable", "duration_ms": 800, "frames": 4 }
+  ]
+}