feat: VIBN-branded file browser on Build tab + sidebar status dot

- Build page: full file tree (lazy-load dirs) + code preview panel
  with line numbers and token-level syntax colouring (VS Code dark theme)
- New API route /api/projects/[id]/file proxies Gitea contents API
  returning directory listings or decoded file content
- Sidebar Apps section now links to /build instead of raw Gitea URL
- Status indicator replaced with a proper coloured dot (amber/blue/green)
  alongside the status label text

Made-with: Cursor

components/layout/vibn-sidebar.tsx

@@ -295,10 +295,19 @@ export function VIBNSidebar({ workspace }: VIBNSidebarProps) {
                 <div style={{ fontSize: "0.82rem", fontWeight: 700, color: "#1a1a1a", overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap" }}>
                   {project.productName || project.name || "Project"}
                 </div>
-                <div style={{ fontSize: "0.68rem", color: "#a09a90", marginTop: 1 }}>
-                  {project.status === "live" ? "● Live"
-                    : project.status === "building" ? "● Building"
-                    : "● Defining"}
+                <div style={{ display: "flex", alignItems: "center", gap: 5, marginTop: 3 }}>
+                  <span style={{
+                    width: 6, height: 6, borderRadius: "50%", flexShrink: 0,
+                    background: project.status === "live" ? "#2e7d32"
+                      : project.status === "building" ? "#3d5afe"
+                      : "#d4a04a",
+                    display: "inline-block",
+                  }} />
+                  <span style={{ fontSize: "0.68rem", color: "#8a8478" }}>
+                    {project.status === "live" ? "Live"
+                      : project.status === "building" ? "Building"
+                      : "Defining"}
+                  </span>
                 </div>
               </div>
             )}
@@ -311,12 +320,12 @@ export function VIBNSidebar({ workspace }: VIBNSidebarProps) {
                   key={app.name}
                   icon="▢"
                   label={app.name}
-                  href={project.giteaRepoUrl ? `${project.giteaRepoUrl}/src/branch/main/${app.path}` : undefined}
+                  href={`${base}/build`}
                   collapsed={collapsed}
                 />
               ))
             ) : (
-              <SectionRow icon="▢" label="No apps yet" dim collapsed={collapsed} />
+              <SectionRow icon="▢" label="No apps yet" dim href={`${base}/build`} collapsed={collapsed} />
             )}
 
             <SectionDivider />