T-PROV-R step9b: 修复切换中转态 invalid args + ProviderView 颜色守卫

- switch_provider_mode / save_provider_profile 的 invoke 参数包进 request:，
  匹配 Rust 单结构体参数签名，修复「missing required key request」报错
- styles.css 改用已定义主题变量(--primary/--danger-border/--danger-text)，
  移除未定义的 --accent/--danger 及硬编码兜底色，通过 theme color guard

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: hl9565

apps/codex-pilot-manager/src/styles.css

@@ -2428,8 +2428,8 @@ dd {
 }
 
 .profileRow.active {
-  border-color: var(--accent, #3b82f6);
-  background: color-mix(in srgb, var(--accent, #3b82f6) 6%, var(--surface));
+  border-color: var(--primary);
+  background: color-mix(in srgb, var(--primary) 6%, var(--surface));
 }
 
 .profileInfo {
@@ -2467,11 +2467,11 @@ dd {
 /* ── Provider: 错误面板 ── */
 
 .errorPanel {
-  border-color: var(--danger, #ef4444) !important;
+  border-color: var(--danger-border) !important;
 }
 
 .errorText {
-  color: var(--danger, #ef4444);
+  color: var(--danger-text);
   font-size: 0.85rem;
 }
 

apps/codex-pilot-manager/src/views/ProviderView.tsx

@@ -93,11 +93,13 @@ export function ProviderView({
     }
     runAction("save", () =>
       callBackend("save_provider_profile", {
-        id: isCreating ? `${Date.now()}-${Math.random().toString(36).slice(2, 8)}` : editingId,
-        name: profileName.trim(),
-        baseUrl: baseUrl.trim(),
-        bearerToken: bearerToken.trim(),
-        upstreamProtocol,
+        request: {
+          id: isCreating ? `${Date.now()}-${Math.random().toString(36).slice(2, 8)}` : editingId,
+          name: profileName.trim(),
+          baseUrl: baseUrl.trim(),
+          bearerToken: bearerToken.trim(),
+          upstreamProtocol,
+        },
       })
     ).then(() => {
       setIsCreating(false);
@@ -118,11 +120,13 @@ export function ProviderView({
   const switchMode = (mode: string, profileId?: string) => {
     runAction("switch", () =>
       callBackend("switch_provider_mode", {
-        mode,
-        profileId: profileId ?? "",
-        baseUrl: "",
-        apiKey: "",
-        upstreamProtocol: "",
+        request: {
+          mode,
+          profileId: profileId ?? "",
+          baseUrl: "",
+          apiKey: "",
+          upstreamProtocol: "",
+        },
       })
     ).then(() => setSwitchConfirm(null));
   };