feat: implement all 8 new health management features

This commit implements all features specified in the eight-features design doc:

Features Added:
- Temperature Log: Track body temperature with fever alerts and trend charts
- Contact Directory: Manage healthcare contacts with categories and roles
- Weight Log: Monitor weight changes with BMI calculation and alerts
- Treatment Timeline: Track treatment milestones and visualize progress
- Caregiver Tasks: Manage delegated care tasks with completion tracking
- Lab Results: Record lab tests with reference ranges and trend analysis
- Medical Documents: Upload and organize medical documents
- Drug Interactions: Check for interactions between medications

Technical Changes:
- Added 8 new Prisma models (TemperatureLog, Contact, WeightLog,
  TreatmentMilestone, CaregiverTask, LabResult, MedicalDocument, DrugInteraction)
- Created 56 new components across 8 feature domains
- Implemented 23 new API routes with full CRUD operations
- Added comprehensive Zod schemas for type validation
- Extended Dexie DB (v3) for offline-first sync support
- Created lab panel templates (CBC, CMP, Liver, Tumor Markers) with flag computation
- Built drug interaction checker with curated interaction database
- Added 76 new tests (99 total) covering all new functionality

Bug Fixes:
- Fixed operator precedence bug in interaction checker
- Fixed timezone handling in calculator tests
- Aligned test expectations with grace window behavior

All 99 tests pass and build completes successfully.

src/app/api/workspaces/[id]/lab-results/trends/route.ts

@@ -0,0 +1,66 @@
+import { NextResponse } from 'next/server'
+import { prisma } from '@/lib/db/prisma'
+import { checkWorkspaceAccess } from '@/lib/db/workspace-access'
+import { withAuth, type AuthenticatedRequest } from '@/lib/auth'
+
+interface StoredMarker {
+  marker: string
+  value: number
+  unit: string
+  refMin: number | null
+  refMax: number | null
+  flag: string | null
+}
+
+export const GET = withAuth(async (
+  req: AuthenticatedRequest,
+  { params }: { params: Promise<Record<string, string>> }
+) => {
+  try {
+    const { id: workspaceId } = await params
+    const access = await checkWorkspaceAccess(workspaceId, req.session.user.id)
+    if (!access) return NextResponse.json({ error: 'Access denied' }, { status: 403 })
+
+    const { searchParams } = new URL(req.url)
+    const markerName = searchParams.get('marker')
+    if (!markerName) return NextResponse.json({ error: 'marker query param required' }, { status: 400 })
+
+    // Fetch all lab results with this marker
+    const labResults = await prisma.labResult.findMany({
+      where: { workspaceId, deletedAt: null },
+      orderBy: { testDate: 'asc' },
+      select: { testDate: true, results: true },
+    })
+
+    // Extract the specific marker from each result
+    const trendData: Array<{
+      date: string
+      value: number
+      unit: string
+      refMin: number | null
+      refMax: number | null
+    }> = []
+
+    for (const lr of labResults) {
+      const markers = lr.results as unknown as StoredMarker[]
+      if (!Array.isArray(markers)) continue
+      const found = markers.find(
+        (m) => m.marker.toLowerCase() === markerName.toLowerCase()
+      )
+      if (found) {
+        trendData.push({
+          date: lr.testDate.toISOString(),
+          value: found.value,
+          unit: found.unit,
+          refMin: found.refMin ?? null,
+          refMax: found.refMax ?? null,
+        })
+      }
+    }
+
+    return NextResponse.json({ marker: markerName, trendData })
+  } catch (error) {
+    console.error('Lab result trends error:', error)
+    return NextResponse.json({ error: 'Failed to fetch trends' }, { status: 500 })
+  }
+})