Replace untyped projectedFlowData with explicit typed variables in MonthlyFlow.vue

[Copilot]

projectedFlowData was inferred as any due to being initialized as [] in one branch and an object in another, making API shape mismatches invisible to the compiler.

Changes

• Split into two explicitly typed const variables, each scoped to its context:
  • projectedFlowDataMid: number[]
  • projectedFlowDataExtremes: Record<string, number[]>
• Ternary initialization replaces the mutable let + imperative if/else — both fall back to an empty value when not in the matching context and are only accessed within their respective branch

const projectedFlowDataMid: number[] =
  appContext.value === 'mid'
    ? Object.keys(monthLabels).map(
        monthKey => props.streamMonthlyFlow['projected'][appContext.value][monthKey]
      )
    : []

const projectedFlowDataExtremes: Record<string, number[]> =
  appContext.value === 'extremes'
    ? props.streamMonthlyFlow['projected'][appContext.value]
    : {}

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[cstephen]

Closing this without merging. It fixed the type of projectedFlowData but made the code harder to read in the process. Fixed in 7eb6ad6 instead.