Fix session persistence after page refresh

Root cause: loadManuallyCreatedProjects() was restoring projects with
stale session arrays from localStorage. When loadProjects() tried to
merge with fresh API data, the stale sessions would override.

Fix 1: In loadManuallyCreatedProjects(), reset the sessions array to
empty for each loaded project. This ensures sessions always come from
the API (authoritative source) rather than localStorage.

Fix 2: In createSessionInFolder(), remove the redundant initialize()
call after loadProjects(). initialize() would reload stale localStorage
data, undoing the fresh data fetched by loadProjects().

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.agent/metrics/metrics_20260122_144519.json

@@ -0,0 +1,43 @@
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+      "success": true,
+      "error": "",
+      "timestamp": "2026-01-22T14:45:19.546647",
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