Finalize Dexie-to-SQLite migration prep: docs, circular dep removal, SQL helpers, tests

- Removed all vestigial Dexie/USE_DEXIE_DB references from code and docs
- Centralized DB logic in PlatformServiceMixin; resolved logger/databaseUtil circular dependency
- Modularized SQL helpers (`$generateInsertStatement`, `$generateUpdateStatement`) and added unit tests
- Created/updated migration tracking docs and helper script for cross-machine progress
- Confirmed all lint/type checks and tests pass; ready for systematic file migration

doc/migration-quick-reference.md

@@ -0,0 +1,94 @@
+# Migration Quick Reference Card
+
+## 🚀 **Quick Start Commands**
+
+```bash
+# Check current progress
+./scripts/migration-helper.sh progress
+
+# See what files need migration
+./scripts/migration-helper.sh files
+
+# Get migration patterns
+./scripts/migration-helper.sh patterns
+
+# Validate current state
+./scripts/migration-helper.sh validate
+```
+
+## 📊 **Current Status**
+
+- **Total Files**: 52
+- **Migrated**: 0
+- **Progress**: 0%
+- **Current Phase**: Day 1 - PlatformServiceMixin Completion
+
+## 🔄 **Migration Pattern (Copy-Paste Template)**
+
+```typescript
+// 1. Add import
+import { PlatformServiceMixin } from "@/utils/PlatformServiceMixin";
+
+// 2. Add to component
+export default class ComponentName extends Vue {
+  mixins = [PlatformServiceMixin];
+  
+  // 3. Replace method calls
+  async someMethod() {
+    // Before: generateInsertStatement(contact, 'contacts')
+    // After:  this.$generateInsertStatement(contact, 'contacts')
+  }
+}
+```
+
+## 📝 **Common Replacements**
+
+| Old | New |
+|-----|-----|
+| `generateInsertStatement` | `this.$generateInsertStatement` |
+| `generateUpdateStatement` | `this.$generateUpdateStatement` |
+| `parseJsonField` | `this._parseJsonField` |
+| `mapColumnsToValues` | `this._mapColumnsToValues` |
+| `logToDb` | `this.$log` |
+| `logConsoleAndDb` | `this.$logAndConsole` |
+| `memoryLogs` | `this.$memoryLogs` |
+
+## 🎯 **Priority Order**
+
+1. **Views** (25 files) - User-facing components
+2. **Components** (15 files) - Reusable UI components  
+3. **Services** (8 files) - Business logic
+4. **Utils** (4 files) - Utility functions
+
+## ✅ **Validation Checklist**
+
+After each file migration:
+- [ ] No databaseUtil imports
+- [ ] PlatformServiceMixin added
+- [ ] Method calls updated
+- [ ] Linting passes
+- [ ] TypeScript compiles
+
+## 📋 **Key Files to Track**
+
+- **Progress Tracker**: `doc/migration-progress-tracker.md`
+- **Completion Plan**: `doc/platformservicemixin-completion-plan.md`
+- **Helper Script**: `scripts/migration-helper.sh`
+
+## 🆘 **Quick Help**
+
+```bash
+# Show all migration info
+./scripts/migration-helper.sh all
+
+# Count remaining files
+find src -name "*.vue" -o -name "*.ts" | xargs grep -l "import.*databaseUtil" | wc -l
+
+# Run validation
+npm run lint && npx tsc --noEmit
+```
+
+---
+
+**Last Updated**: $(date)
+**Full Documentation**: `doc/migration-progress-tracker.md`