feat: PostHog product analytics (#58)

* wip: posthog analytics

* wip: remove posthog-rs crate; call endpoint directly

* make analytics non-blocking

* session start event

* configure analytics for release builds

* remove dev_server_stopped event

* address review comments

* simplify analytics enabled logic

* analytics on by default; send start_session when user enables analytics; new task_attempt_start event

* lower visibility of analytics logs

* chore: bump version to 0.0.37-0

* set analytics to true if previously unset

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Co-authored-by: GitHub Action <action@github.com>

npx-cli/package.json

@@ -1,7 +1,7 @@
 {
   "name": "vibe-kanban",
   "private": false,
-  "version": "0.0.37-clash.0",
+  "version": "0.0.37-0",
   "main": "index.js",
   "bin": {
     "vibe-kanban": "bin/cli.js"
@@ -14,4 +14,4 @@
     "dist",
     "bin"
   ]
-}
+}