fix(FN-XXX): harden windows path handling

packages/dashboard/src/__tests__/skills-adapter.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
-import { createSkillsAdapter } from "../skills-adapter.js";
+import { createSkillsAdapter, extractSkillName } from "../skills-adapter.js";
 import { writeFile, mkdir, access } from "node:fs/promises";
 import { join, dirname } from "node:path";
 import { tmpdir } from "node:os";
@@ -531,3 +531,10 @@ describe("createSkillsAdapter - readSkillContent", () => {
     await cleanup(skillDir);
   });
 });
+
+describe("extractSkillName", () => {
+  it("normalizes Windows separators before deriving the display name", () => {
+    expect(extractSkillName("skills\\tooling\\windows-fix", "npm")).toBe("tooling/windows-fix");
+    expect(extractSkillName("windows-fix", "npm")).toBe("windows-fix");
+  });
+});

packages/dashboard/src/__tests__/usage.test.ts

@@ -106,6 +106,24 @@ describe("usage", () => {
       expect(second).not.toBe(first);
       expect(second).toHaveLength(0);
     });
+
+    it("falls back to USERPROFILE when HOME is unset", async () => {
+      vi.stubEnv("HOME", "");
+      vi.stubEnv("USERPROFILE", "/profiles/test-user");
+
+      mockReadFile.mockImplementation(async () => {
+        return Promise.reject(new Error("File not found"));
+      });
+
+      await fetchAllProviderUsage();
+
+      const readPaths = mockReadFile.mock.calls.map(([filePath]) => String(filePath));
+      expect(readPaths).toContain("/profiles/test-user/.claude/.credentials.json");
+      expect(readPaths).toContain("/profiles/test-user/.config/claude/.credentials.json");
+      expect(readPaths).toContain("/profiles/test-user/.codex/auth.json");
+      expect(readPaths).toContain("/profiles/test-user/.gemini/oauth_creds.json");
+      expect(readPaths.some((filePath) => filePath.startsWith("/home/testuser/"))).toBe(false);
+    });
   });
 
   describe("fetchGitHubCopilotUsage (via fetchAllProviderUsage)", () => {