fix: remove unused eslint-disable directive; inject PostHog key in CI build

- posthog.ts: drop redundant no-console disable (project has no no-console rule;
  --report-unused-disable-directives failed CI lint)
- desktop-build.yml: pass VITE_PUBLIC_POSTHOG_KEY/HOST into the frontend build
  so released DMGs actually report analytics (was no-op without the key)

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

.github/workflows/desktop-build.yml

@@ -62,6 +62,14 @@ jobs:
         run: cargo install tauri-cli --locked --version "^2.0"
 
       - name: Build desktop app (PBS route)
+        env:
+          # PostHog analytics. The phc_ key is a public client key (it ships in
+          # the frontend bundle anyway), but we keep it in repo Secrets so it's
+          # easy to rotate and not hard-coded. Set this secret in
+          # Settings -> Secrets and variables -> Actions. If unset, the build
+          # still succeeds and analytics is a no-op at runtime.
+          VITE_PUBLIC_POSTHOG_KEY: ${{ secrets.VITE_PUBLIC_POSTHOG_KEY }}
+          VITE_PUBLIC_POSTHOG_HOST: ${{ vars.VITE_PUBLIC_POSTHOG_HOST || 'https://us.i.posthog.com' }}
         run: bash scripts/build_macos_arm.sh
 
       - name: Upload DMG artifact

frontend/src/analytics/posthog.ts

@@ -39,7 +39,6 @@ export function initAnalytics(): void {
   if (initialized) return
   if (!POSTHOG_KEY) {
     if (import.meta.env.DEV) {
-      // eslint-disable-next-line no-console
       console.info('[analytics] 未配置 VITE_PUBLIC_POSTHOG_KEY，埋点已禁用')
     }
     return