Add comprehensive migration documentation and testing infrastructure

- Add TODO annotation to MembersList.vue requiring human testing validation
- Create migration templates for systematic component migration
- Add best practices guide for PlatformServiceMixin usage
- Create ESLint rules template for pattern enforcement
- Add validation script to track migration progress
- Document Phase 1 completion summary with current state

Migration Infrastructure:
- Component migration checklist template
- Automated validation script (validate-migration.sh)
- Best practices documentation
- ESLint rules for preventing regression

Status: MembersList.vue migration complete but requires human testing
Next: Select next component for migration when ready to continue

docs/migration-templates/component-migration.md

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+# Component Migration Template
+
+## Overview
+This template provides step-by-step instructions for migrating Vue components from legacy patterns to PlatformServiceMixin.
+
+## Before Migration Checklist
+
+- [ ] Component uses `import * as databaseUtil`
+- [ ] Component uses `import { logConsoleAndDb }`  
+- [ ] Component has direct `PlatformServiceFactory.getInstance()` calls
+- [ ] Component has manual error handling for database operations
+- [ ] Component has verbose SQL result processing
+
+## Step-by-Step Migration
+
+### Step 1: Update Imports
+
+```typescript
+// ❌ BEFORE - Legacy imports
+import * as databaseUtil from "../db/databaseUtil";
+import { logConsoleAndDb } from "../db/databaseUtil";
+import { PlatformServiceFactory } from "../services/PlatformServiceFactory";
+
+// ✅ AFTER - Clean imports
+import { PlatformServiceMixin } from "@/utils/PlatformServiceMixin";
+import { Contact } from "@/db/tables/contacts";
+import { Settings } from "@/db/tables/settings";
+```
+
+### Step 2: Add Mixin to Component
+
+```typescript
+// ❌ BEFORE - No mixin
+@Component({
+  components: { /* ... */ }
+})
+export default class MyComponent extends Vue {
+  // ...
+}
+
+// ✅ AFTER - With mixin
+@Component({
+  components: { /* ... */ }
+})
+export default class MyComponent extends Vue {
+  mixins: [PlatformServiceMixin],
+  // ...
+}
+```
+
+### Step 3: Replace Database Operations
+
+```typescript
+// ❌ BEFORE - Legacy database access
+async loadContacts() {
+  try {
+    const platformService = PlatformServiceFactory.getInstance();
+    const result = await platformService.dbQuery("SELECT * FROM contacts");
+    const contacts = databaseUtil.mapQueryResultToValues(result);
+    await logConsoleAndDb("Contacts loaded successfully");
+    return contacts;
+  } catch (error) {
+    await logConsoleAndDb("Error loading contacts: " + error, true);
+    throw error;
+  }
+}
+
+// ✅ AFTER - Mixin methods
+async loadContacts() {
+  try {
+    const contacts = await this.$getAllContacts();
+    await this.$log("Contacts loaded successfully");
+    return contacts;
+  } catch (error) {
+    await this.$logError(`[${this.$options.name}] Error loading contacts: ${error}`);
+    throw error;
+  }
+}
+```
+
+### Step 4: Replace Settings Operations
+
+```typescript
+// ❌ BEFORE - Legacy settings access
+async loadSettings() {
+  const settingsRow = await databaseUtil.retrieveSettingsForActiveAccount();
+  const settings = settingsRow || {};
+  return settings;
+}
+
+async saveSettings(changes: Partial<Settings>) {
+  await databaseUtil.updateDefaultSettings(changes);
+  await logConsoleAndDb("Settings saved");
+}
+
+// ✅ AFTER - Mixin methods
+async loadSettings() {
+  return await this.$settings();
+}
+
+async saveSettings(changes: Partial<Settings>) {
+  await this.$saveSettings(changes);
+  await this.$log("Settings saved");
+}
+```
+
+### Step 5: Replace Logging Operations
+
+```typescript
+// ❌ BEFORE - Legacy logging
+try {
+  // operation
+} catch (error) {
+  console.error("Error occurred:", error);
+  await logConsoleAndDb("Error: " + error, true);
+}
+
+// ✅ AFTER - Mixin logging
+try {
+  // operation
+} catch (error) {
+  await this.$logError(`[${this.$options.name}] Error: ${error}`);
+}
+```
+
+## Common Migration Patterns
+
+### Pattern 1: Database Query + Result Processing
+
+```typescript
+// ❌ BEFORE
+const platformService = PlatformServiceFactory.getInstance();
+const result = await platformService.dbQuery(sql, params);
+const processed = databaseUtil.mapQueryResultToValues(result);
+
+// ✅ AFTER
+const processed = await this.$query(sql, params);
+```
+
+### Pattern 2: Settings Retrieval
+
+```typescript
+// ❌ BEFORE
+const settingsRow = await databaseUtil.retrieveSettingsForActiveAccount();
+const value = settingsRow?.[field] || defaultValue;
+
+// ✅ AFTER
+const settings = await this.$settings();
+const value = settings[field] || defaultValue;
+```
+
+### Pattern 3: Contact Operations
+
+```typescript
+// ❌ BEFORE
+const platformService = PlatformServiceFactory.getInstance();
+const contacts = await platformService.dbQuery("SELECT * FROM contacts");
+const mappedContacts = databaseUtil.mapQueryResultToValues(contacts);
+
+// ✅ AFTER
+const contacts = await this.$getAllContacts();
+```
+
+### Pattern 4: Error Handling
+
+```typescript
+// ❌ BEFORE
+try {
+  // operation
+} catch (error) {
+  console.error("[MyComponent] Error:", error);
+  await databaseUtil.logToDb("Error: " + error, "error");
+}
+
+// ✅ AFTER
+try {
+  // operation
+} catch (error) {
+  await this.$logError(`[${this.$options.name}] Error: ${error}`);
+}
+```
+
+## After Migration Checklist
+
+- [ ] All `databaseUtil` imports removed
+- [ ] All `logConsoleAndDb` imports removed
+- [ ] All direct `PlatformServiceFactory.getInstance()` calls removed
+- [ ] Component includes `PlatformServiceMixin` in mixins array
+- [ ] Database operations use mixin methods (`$db`, `$query`, `$getAllContacts`, etc.)
+- [ ] Settings operations use mixin methods (`$settings`, `$saveSettings`)
+- [ ] Logging uses mixin methods (`$log`, `$logError`, `$logAndConsole`)
+- [ ] Error handling includes component name context
+- [ ] Component compiles without TypeScript errors
+- [ ] Component functionality works as expected
+
+## Testing Migration
+
+1. **Compile Check**: `npm run build` should complete without errors
+2. **Runtime Check**: Component should load and function normally
+3. **Logging Check**: Verify logs appear in console and database
+4. **Error Handling Check**: Verify errors are properly logged and handled
+
+## Troubleshooting
+
+### Common Issues
+
+1. **Missing Mixin Methods**: Ensure component properly extends PlatformServiceMixin
+2. **TypeScript Errors**: Check that all types are properly imported
+3. **Runtime Errors**: Verify all async operations are properly awaited
+4. **Missing Context**: Add component name to error messages for better debugging
+
+### Performance Considerations
+
+- Mixin methods include caching for frequently accessed data
+- Database operations are queued and optimized
+- Error logging includes proper context and formatting