feat: 新增流程总览图页面及导航功能

添加流程总览图页面，包含五组十域可交互SVG流程图，支持模块点击跳转至对应流程详情页。同时在侧边栏和首页添加导航入口，优化流程详情页的返回逻辑和布局样式。

src/components/layout/Layout.tsx

@@ -30,9 +30,7 @@ export function Layout({ children }: LayoutProps) {
               sidebarOpen ? 'lg:ml-64' : 'lg:ml-20'
             )}
           >
-            <div className="mx-auto max-w-7xl">
-              {children}
-            </div>
+            {children}
           </main>
         </div>
       </div>

src/components/layout/Sidebar.tsx

@@ -6,6 +6,7 @@ import {
   BookOpen,
   Layers,
   LayoutGrid,
+  Workflow,
   Share2,
   Settings,
   ChevronLeft,
@@ -15,6 +16,7 @@ import {
 const navItems = [
   { path: '/', label: '首页', icon: Home },
   { path: '/process-matrix', label: '49过程矩阵', icon: LayoutGrid },
+  { path: '/process-roadmap', label: '流程总览图', icon: Workflow },
   { path: '/knowledge-areas', label: '知识领域', icon: BookOpen },
   { path: '/process-groups', label: '过程组', icon: Layers },
   { path: '/process-graph', label: '过程关系图', icon: Share2 },

src/components/visualize/ProcessMatrix.tsx

@@ -110,18 +110,26 @@ export function ProcessMatrix({ className, isFullScreen = false }: ProcessMatrix
                           state={{ from: 'matrix' }}
                           className={clsx(
                             "block px-2 py-1.5 rounded text-xs hover:bg-gray-100 dark:hover:bg-gray-700 transition-colors",
-                            isFullScreen && "flex items-center h-full"
+                            isFullScreen && "h-full"
                           )}
+                          title={p.name}
                         >
-                          <span
-                            className="inline-block px-1.5 py-0.5 rounded text-white font-medium mr-1 shrink-0"
-                            style={{ backgroundColor: ka.color, fontSize: '10px' }}
-                          >
-                            {p.code}
-                          </span>
-                          <span className="text-gray-700 dark:text-gray-300 line-clamp-2">
-                            {p.name}
-                          </span>
+                          <div className={clsx("flex items-center gap-1 min-w-0", isFullScreen && "h-full")}>
+                            <span
+                              className="inline-block px-1.5 py-0.5 rounded text-white font-medium shrink-0"
+                              style={{ backgroundColor: ka.color, fontSize: '10px' }}
+                            >
+                              {p.code}
+                            </span>
+                            <span
+                              className={clsx(
+                                "block min-w-0 text-gray-700 dark:text-gray-300",
+                                isFullScreen ? "line-clamp-2" : "truncate"
+                              )}
+                            >
+                              {p.name}
+                            </span>
+                          </div>
                         </Link>
                       ))}
                       {cellProcesses.length === 0 && (