fix(vibesuite): prevent logged-in crash when learnedSkills is not an array The progress-hydration effect iterated accountData.learnedSkills with for...of, guarded only by ?? [], which catches null/undefined but not other non-array shapes returned by /api/users/me. A non-iterable value threw "is not iterable" during render, blanking the whole page for logged-in users while guests (accountData null) were unaffected. Guard with Array.isArray so only real arrays are hydrated. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>#160