Add Dynamic Poll Web Part with core functionality and styling

- Initialize Gulp build process with gulpfile.js
- Create package.json for project dependencies and scripts
- Add TypeScript declarations for SCSS modules
- Implement DynamicPollWebPart with property pane configuration
- Create PollDataService for SharePoint list interactions
- Develop core polling logic in PollCore.ts
- Define types for polls and answers in PollTypes.ts
- Create React components for DynamicPoll UI
- Add localization support for English and German
- Implement unit tests for core polling functionality
- Set up TypeScript and TSLint configurations

tests/PollCore.test.ts

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+import { calculatePollResults, findUserAnswer, selectActivePoll } from '../src/webparts/dynamicPoll/PollCore';
+import { IPoll, IPollAnswer } from '../src/webparts/dynamicPoll/PollTypes';
+
+let passed: number = 0;
+function assert(name: string, condition: boolean): void {
+  if (!condition) { throw new Error('FAILED: ' + name); }
+  passed++; console.log('OK:', name);
+}
+function poll(value: any): IPoll { return value as IPoll; } // tslint:disable-line:no-any
+
+const now: Date = new Date('2026-08-23T12:00:00Z');
+const selected: IPoll = selectActivePoll([
+  poll({ id: 1, question: 'old', options: ['A'], isActive: true,
+    startDate: new Date('2026-08-20T00:00:00Z'), endDate: new Date('2026-08-22T00:00:00Z') }),
+  poll({ id: 2, question: 'current', options: ['A', 'B'], isActive: true,
+    startDate: new Date('2026-08-23T00:00:00Z'), endDate: new Date('2026-08-24T00:00:00Z') }),
+  poll({ id: 3, question: 'future', options: ['A'], isActive: true,
+    startDate: new Date('2026-08-24T00:00:00Z') })
+], now);
+assert('current poll is selected by activation window', !!selected && selected.id === 2);
+
+const answers: IPollAnswer[] = [
+  { id: 1, userKey: 'one@contoso.local', answer: 'A' },
+  { id: 2, userKey: 'two@contoso.local', answer: 'B' },
+  { id: 3, userKey: 'three@contoso.local', answer: 'A' },
+  { id: 4, userKey: 'legacy@contoso.local', answer: 'Removed option' }
+];
+const results = calculatePollResults(['A', 'B'], answers);
+assert('votes are counted per configured option', results[0].votes === 2 && results[1].votes === 1);
+assert('invalid legacy answer is excluded from percentage', results[0].percentage === 67 && results[1].percentage === 33);
+assert('user lookup is case insensitive', findUserAnswer(answers, 'ONE@CONTOSO.LOCAL') === 'A');
+assert('unknown user has no answer', findUserAnswer(answers, 'unknown@contoso.local') === '');
+console.log('DynamicPoll core tests passed:', passed);
+

tests/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "outDir": "../temp/tests",
+    "skipLibCheck": true,
+    "typeRoots": ["../node_modules/@types", "../node_modules/@microsoft"],
+    "types": ["es6-promise"]
+  },
+  "files": [
+    "../src/webparts/dynamicPoll/PollTypes.ts",
+    "../src/webparts/dynamicPoll/PollCore.ts",
+    "PollCore.test.ts"
+  ]
+}
+

tests/validate-project.js

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+'use strict';
+var fs = require('fs');
+var path = require('path');
+var root = path.resolve(__dirname, '..');
+var passed = 0;
+function read(file) { return fs.readFileSync(path.join(root, file), 'utf8'); }
+function json(file) { return JSON.parse(read(file)); }
+function assert(condition, message) { if (!condition) { throw new Error(message); } passed++; }
+
+var packageJson = json('package.json');
+var solution = json('config/package-solution.json').solution;
+var manifest = json('src/webparts/dynamicPoll/DynamicPollWebPart.manifest.json');
+var webPart = read('src/webparts/dynamicPoll/DynamicPollWebPart.ts');
+var service = read('src/webparts/dynamicPoll/PollDataService.ts');
+var component = read('src/webparts/dynamicPoll/components/DynamicPoll.tsx');
+var styles = read('src/webparts/dynamicPoll/components/DynamicPoll.module.scss');
+
+assert(packageJson.version === '1.0.0' && solution.version === '1.0.0.0', 'Version mismatch.');
+assert(solution.includeClientSideAssets === true && solution.skipFeatureDeployment === true, 'Central deployment missing.');
+assert(manifest.componentType === 'WebPart', 'Component is not a web part.');
+assert(webPart.indexOf("PropertyPaneDropdown('pollListId'") >= 0 && webPart.indexOf("PropertyPaneDropdown('answerListId'") >= 0,
+  'List selection is missing.');
+assert(service.indexOf("'PollId': pollId") >= 0 && service.indexOf("'Answer': answer") >= 0, 'Vote persistence is missing.');
+assert(service.indexOf("new Error('ALREADY_VOTED')") >= 0, 'Duplicate vote protection is missing.');
+assert(service.indexOf("new Error('POLL_NOT_ACTIVE')") >= 0, 'Active poll and answer validation is missing.');
+assert(component.indexOf("type='radio'") >= 0 && component.indexOf("role='progressbar'") >= 0,
+  'Accessible voting or results UI is missing.');
+assert(fs.existsSync(path.join(root, 'deployment/Initialize-DynamicPollLists.ps1')), 'Provisioning script is missing.');
+['neutralPrimary', 'neutralLight', 'themePrimary', 'themeDark', 'white'].forEach(function (slot) {
+  assert(styles.indexOf('[theme: ' + slot + ', default:') >= 0, 'Theme slot missing: ' + slot);
+});
+console.log('DynamicPoll project validation passed:', passed);