fix: add defensive checks to BudgetChartAnalysis chart data
- Added null checks for overallStats.month/year in gauge charts - Added null checks for burndown and year burndown charts - Fixed BaseChart.vue template using undefined 'chartData' variable - Changed :data="chartData" to :data="data" to use prop directly Fixes console errors when viewing /budget-v2 page Verified: 0 errors, only 1 harmless plugin warning Refs: openspec/changes/migrate-remaining-echarts-to-chartjs
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