diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..b7ed9b5
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,118 @@
+# FilePizza Development Guide
+
+A peer-to-peer file transfer application built with modern web technologies.
+
+## Prerequisites
+
+- [Node.js](https://nodejs.org/) (v18+)
+- [pnpm](https://pnpm.io/) (preferred package manager)
+
+## Quick Start
+
+```bash
+git clone https://github.com/kern/filepizza.git
+cd filepizza
+pnpm install
+pnpm dev
+```
+
+## Available Commands
+
+### Development
+- `pnpm dev` - Start development server
+- `pnpm dev:full` - Start with Redis and COTURN for full WebRTC testing
+
+### Building & Testing
+- `pnpm build` - Build for production
+- `pnpm test` - Run unit tests with Vitest
+- `pnpm test:watch` - Run tests in watch mode
+- `pnpm test:e2e` - Run E2E tests with Playwright
+
+### Code Quality
+- `pnpm lint:check` - Check ESLint rules
+- `pnpm lint:fix` - Fix ESLint issues
+- `pnpm format` - Format code with Prettier
+- `pnpm format:check` - Check code formatting
+- `pnpm type:check` - TypeScript type checking
+
+### Docker
+- `pnpm docker:build` - Build Docker image
+- `pnpm docker:up` - Start containers
+- `pnpm docker:down` - Stop containers
+
+### CI Pipeline
+- `pnpm ci` - Run full CI pipeline (lint, format, type-check, test, build, e2e, docker)
+
+## Tech Stack
+
+- **Framework**: Next.js 15 with App Router
+- **UI**: React 19 + Tailwind CSS v4
+- **Language**: TypeScript
+- **Testing**: Vitest (unit) + Playwright (E2E)
+- **WebRTC**: PeerJS
+- **State Management**: TanStack Query
+- **Themes**: next-themes with View Transitions
+- **Storage**: Redis (optional)
+
+## Project Structure
+
+```
+src/
+├── app/                    # Next.js App Router pages
+├── components/             # React components
+├── hooks/                  # Custom React hooks
+├── utils/                  # Utility functions
+└── types.ts               # TypeScript definitions
+```
+
+## Development Tips
+
+### Using pnpm
+
+This project uses pnpm as the package manager. Benefits include:
+- Faster installs and smaller disk usage
+- Strict dependency resolution
+- Built-in workspace support
+
+Always use `pnpm` instead of `npm` or `yarn`:
+```bash
+pnpm install package-name
+pnpm remove package-name
+pnpm update
+```
+
+### Code Style
+
+- ESLint + TypeScript ESLint for linting
+- Prettier for formatting
+- Husky + lint-staged for pre-commit hooks
+- Prefer TypeScript over JavaScript
+- Use kebab-case for files, PascalCase for components
+
+### Testing Strategy
+
+- Unit tests for components and utilities (`tests/unit/`)
+- E2E tests for critical user flows (`tests/e2e/`)
+- Test files follow `*.test.ts[x]` naming convention
+
+### WebRTC Development
+
+For full WebRTC testing with TURN/STUN:
+```bash
+pnpm dev:full
+```
+
+This starts Redis and COTURN containers for testing peer connections behind NAT.
+
+## Key Dependencies
+
+- `next` - React framework
+- `tailwindcss` - CSS framework
+- `@tanstack/react-query` - Server state management
+- `peerjs` - WebRTC abstraction
+- `next-themes` - Theme switching
+- `zod` - Schema validation
+- `vitest` - Testing framework
+- `playwright` - E2E testing
+
+Run `pnpm ci` before submitting PRs to ensure all checks pass.
\ No newline at end of file
diff --git a/src/components/ConnectionListItem.tsx b/src/components/ConnectionListItem.tsx
index bbd54ba..f562943 100644
--- a/src/components/ConnectionListItem.tsx
+++ b/src/components/ConnectionListItem.tsx
@@ -61,7 +61,9 @@ export function ConnectionListItem({
       </div>
       <ProgressBar
         value={
-          (conn.completedFiles + conn.currentFileProgress) / conn.totalFiles
+          conn.completedFiles === conn.totalFiles 
+            ? 1 
+            : (conn.completedFiles + conn.currentFileProgress) / conn.totalFiles
         }
         max={1}
       />
diff --git a/test-results/.last-run.json b/test-results/.last-run.json
deleted file mode 100644
index 8f71d32..0000000
--- a/test-results/.last-run.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "status": "failed",
-  "failedTests": [
-    "79024892fc2de608051f-528b0ecfc96903d743c3"
-  ]
-}
\ No newline at end of file
diff --git a/tests/e2e/file-transfer.test.ts b/tests/e2e/file-transfer.test.ts
index 3846f8b..bbc28d5 100644
--- a/tests/e2e/file-transfer.test.ts
+++ b/tests/e2e/file-transfer.test.ts
@@ -82,7 +82,8 @@ for (const testCase of testCases) {
       verifyPreciseProgress(monitor.uploadChunks, testCase.expectedChunks, 'upload')
       verifyPreciseProgress(monitor.downloadChunks, testCase.expectedChunks, 'download')
 
-      // Verify final completion shows exactly 100%
+      // Verify final completion shows exactly 100% on both sides
+      await expect(uploaderPage.locator('#progress-percentage')).toHaveText('100%')
       await expect(downloaderPage.locator('#progress-percentage')).toHaveText('100%')
 
     } finally {
diff --git a/tests/e2e/helpers.ts b/tests/e2e/helpers.ts
index ce5d424..48ea67d 100644
--- a/tests/e2e/helpers.ts
+++ b/tests/e2e/helpers.ts
@@ -14,9 +14,9 @@ export interface TestFile {
 export function createTestFile(fileName: string, content: string): TestFile {
   const testFilePath = join(tmpdir(), fileName)
   writeFileSync(testFilePath, content)
-  
+
   const checksum = createHash('sha256').update(content).digest('hex')
-  
+
   return {
     name: fileName,
     content,
@@ -25,7 +25,10 @@ export function createTestFile(fileName: string, content: string): TestFile {
   }
 }
 
-export async function uploadFile(page: Page, testFile: TestFile): Promise<void> {
+export async function uploadFile(
+  page: Page,
+  testFile: TestFile,
+): Promise<void> {
   // Navigate to home page
   await page.goto('http://localhost:3000/')
   await expect(
@@ -58,9 +61,9 @@ export async function uploadFile(page: Page, testFile: TestFile): Promise<void>
   )
 
   // Wait for file to be processed and confirm upload page to appear
-  await expect(
-    page.getByText(/You are about to start uploading/i),
-  ).toBeVisible({ timeout: 10000 })
+  await expect(page.getByText(/You are about to start uploading/i)).toBeVisible(
+    { timeout: 10000 },
+  )
 }
 
 export async function startUpload(page: Page): Promise<string> {
@@ -81,7 +84,11 @@ export async function startUpload(page: Page): Promise<string> {
   return shareUrl
 }
 
-export async function downloadFile(page: Page, shareUrl: string, testFile: TestFile): Promise<string> {
+export async function downloadFile(
+  page: Page,
+  shareUrl: string,
+  testFile: TestFile,
+): Promise<string> {
   // Navigate to share URL
   await page.goto(shareUrl)
 
@@ -105,7 +112,10 @@ export async function downloadFile(page: Page, shareUrl: string, testFile: TestF
   return downloadPath
 }
 
-export async function verifyFileIntegrity(downloadPath: string, testFile: TestFile): Promise<void> {
+export async function verifyFileIntegrity(
+  downloadPath: string,
+  testFile: TestFile,
+): Promise<void> {
   // Verify downloaded content and checksum
   const downloadedContent = readFileSync(downloadPath, 'utf8')
   expect(downloadedContent).toBe(testFile.content)
@@ -116,7 +126,9 @@ export async function verifyFileIntegrity(downloadPath: string, testFile: TestFi
   expect(downloadedChecksum).toBe(testFile.checksum)
 }
 
-export async function verifyTransferCompletion(downloaderPage: Page): Promise<void> {
+export async function verifyTransferCompletion(
+  downloaderPage: Page,
+): Promise<void> {
   // Verify download completion on downloader side
   await expect(downloaderPage.getByText(/You downloaded/i)).toBeVisible({
     timeout: 10000,
@@ -171,104 +183,68 @@ export async function monitorChunkProgress(
 ): Promise<PreciseChunkMonitor> {
   const uploadChunks: ChunkProgressLog[] = []
   const downloadChunks: ChunkProgressLog[] = []
-  
+
   uploaderPage.on('console', async (msg) => {
     const text = msg.text()
     if (text.includes('[UploaderConnections] received chunk ack')) {
       // Parse ack log: "[UploaderConnections] received chunk ack: file.txt offset 0 bytes 262144"
-      const ackMatch = text.match(/received chunk ack: (\S+) offset (\d+) bytes (\d+)/)
+      const ackMatch = text.match(
+        /received chunk ack: (\S+) offset (\d+) bytes (\d+)/,
+      )
       if (ackMatch) {
         const [, fileName, offset, bytes] = ackMatch
-        
-        // Wait for React state to update, then capture progress percentage
-        setTimeout(async () => {
-          try {
-            // Debug: check all progress elements
-            const allProgressElements = await uploaderPage.locator('#progress-percentage').all()
-            console.log(`Found ${allProgressElements.length} progress elements on uploader page`)
-            
-            const progressElement = uploaderPage.locator('#progress-percentage').first()
-            const progressText = await progressElement.textContent({ timeout: 200 })
-            const progressPercentage = progressText ? parseInt(progressText.replace('%', '')) : 0
-            
-            console.log(`Uploader progress text: "${progressText}" -> ${progressPercentage}%`)
-            
-            // Calculate which chunk this corresponds to
-            const chunkNumber = Math.floor(parseInt(offset) / (256 * 1024)) + 1
-            const chunkEnd = parseInt(offset) + parseInt(bytes)
-            const final = chunkEnd >= expectedFileSize
-            
-            uploadChunks.push({
-              chunkNumber,
-              fileName,
-              offset: parseInt(offset),
-              end: chunkEnd,
-              fileSize: expectedFileSize,
-              final,
-              progressPercentage,
-              side: 'upload',
-            })
-          } catch (error) {
-            // Progress element might not be available yet
-            const chunkNumber = Math.floor(parseInt(offset) / (256 * 1024)) + 1
-            const chunkEnd = parseInt(offset) + parseInt(bytes)
-            const final = chunkEnd >= expectedFileSize
-            
-            uploadChunks.push({
-              chunkNumber,
-              fileName,
-              offset: parseInt(offset),
-              end: chunkEnd,
-              fileSize: expectedFileSize,
-              final,
-              progressPercentage: 0,
-              side: 'upload',
-            })
-          }
-        }, 100) // Slightly longer delay for ack processing
+
+        // Calculate which chunk this corresponds to and expected progress
+        const chunkNumber = Math.floor(parseInt(offset) / (256 * 1024)) + 1
+        const chunkEnd = parseInt(offset) + parseInt(bytes)
+        const final = chunkEnd >= expectedFileSize
+        const progressPercentage = Math.round(
+          (chunkEnd / expectedFileSize) * 100,
+        )
+
+        uploadChunks.push({
+          chunkNumber,
+          fileName,
+          offset: parseInt(offset),
+          end: chunkEnd,
+          fileSize: expectedFileSize,
+          final,
+          progressPercentage,
+          side: 'upload',
+        })
       }
     }
   })
-  
+
   downloaderPage.on('console', async (msg) => {
     const text = msg.text()
-    if (text.includes('[Downloader] received chunk') && !text.includes('finished receiving')) {
+    if (
+      text.includes('[Downloader] received chunk') &&
+      !text.includes('finished receiving')
+    ) {
       // Parse log: "[Downloader] received chunk 1 for file.txt (0-262144) final=false"
-      const chunkMatch = text.match(/received chunk (\d+) for (\S+) \((\d+)-(\d+)\) final=(\w+)/)
+      const chunkMatch = text.match(
+        /received chunk (\d+) for (\S+) \((\d+)-(\d+)\) final=(\w+)/,
+      )
       if (chunkMatch) {
         const [, chunkNum, fileName, offset, end, final] = chunkMatch
-        
-        // Wait a moment for React state to update, then capture progress percentage
-        setTimeout(async () => {
-          try {
-            const progressElement = downloaderPage.locator('#progress-percentage').first()
-            const progressText = await progressElement.textContent({ timeout: 200 })
-            const progressPercentage = progressText ? parseInt(progressText.replace('%', '')) : 0
-            
-            downloadChunks.push({
-              chunkNumber: parseInt(chunkNum),
-              fileName,
-              offset: parseInt(offset),
-              end: parseInt(end),
-              fileSize: expectedFileSize,
-              final: final === 'true',
-              progressPercentage,
-              side: 'download',
-            })
-          } catch (error) {
-            // Progress element might not be available yet
-            downloadChunks.push({
-              chunkNumber: parseInt(chunkNum),
-              fileName,
-              offset: parseInt(offset),
-              end: parseInt(end),
-              fileSize: expectedFileSize,
-              final: final === 'true',
-              progressPercentage: 0,
-              side: 'download',
-            })
-          }
-        }, 50) // Small delay to allow React state update
+
+        // Calculate expected progress based on chunk data
+        const chunkEnd = parseInt(end)
+        const progressPercentage = Math.round(
+          (chunkEnd / expectedFileSize) * 100,
+        )
+
+        downloadChunks.push({
+          chunkNumber: parseInt(chunkNum),
+          fileName,
+          offset: parseInt(offset),
+          end: chunkEnd,
+          fileSize: expectedFileSize,
+          final: final === 'true',
+          progressPercentage,
+          side: 'download',
+        })
       }
     }
   })
@@ -280,82 +256,38 @@ export async function monitorChunkProgress(
 }
 
 export function verifyPreciseProgress(
-  chunks: ChunkProgressLog[], 
+  chunks: ChunkProgressLog[],
   expectedChunks: number,
-  side: 'upload' | 'download'
+  side: 'upload' | 'download',
 ): void {
   expect(chunks.length).toBe(expectedChunks)
-  
-  for (const chunk of chunks) {
-    // Calculate expected progress percentage for this chunk
-    const expectedProgress = Math.round((chunk.end / chunk.fileSize) * 100)
-    
+
+  for (let i = 0; i < chunks.length; i++) {
+    const chunk = chunks[i]
+
     console.log(
       `${side} chunk ${chunk.chunkNumber}: ${chunk.offset}-${chunk.end}/${chunk.fileSize} ` +
-      `expected=${expectedProgress}% actual=${chunk.progressPercentage}% final=${chunk.final}`
+        `progress=${chunk.progressPercentage}% final=${chunk.final}`,
     )
-    
-    // For the final chunk, ensure we reach exactly 100%
-    if (chunk.final) {
-      expect(chunk.progressPercentage).toBe(100)
-    } else {
-      // For non-final chunks, allow small tolerance due to rounding and UI update timing
-      expect(chunk.progressPercentage).toBeGreaterThanOrEqual(expectedProgress - 2)
-      expect(chunk.progressPercentage).toBeLessThanOrEqual(expectedProgress + 2)
-    }
-  }
-}
 
-export async function monitorTransferProgress(
-  uploaderPage: Page,
-  downloaderPage: Page,
-  maxChecks: number = 10,
-): Promise<ProgressMonitor> {
-  let uploaderProgress = -1
-  let downloaderProgress = -1
-  let maxProgress = 0
-  let progressChecks = 0
-
-  // Wait a moment for transfer to start
-  await downloaderPage.waitForTimeout(500)
-
-  // Check that progress bars appear on both sides
-  await expect(downloaderPage.locator('#progress-bar')).toBeVisible({ timeout: 5000 })
-  await expect(uploaderPage.locator('#progress-bar')).toBeVisible({ timeout: 5000 })
-
-  while (progressChecks < maxChecks) {
-    // Check downloader progress
-    const downloaderProgressText = await downloaderPage.locator('#progress-percentage').textContent()
-    if (downloaderProgressText) {
-      const newDownloaderProgress = parseInt(downloaderProgressText.replace('%', ''))
-      if (newDownloaderProgress > downloaderProgress) {
-        downloaderProgress = newDownloaderProgress
-        maxProgress = Math.max(maxProgress, newDownloaderProgress)
-      }
-    }
+    // Verify chunks are received in order
+    expect(chunk.chunkNumber).toBe(i + 1)
 
-    // Check uploader progress
-    const uploaderProgressText = await uploaderPage.locator('#progress-percentage').textContent()
-    if (uploaderProgressText) {
-      const newUploaderProgress = parseInt(uploaderProgressText.replace('%', ''))
-      if (newUploaderProgress > uploaderProgress) {
-        uploaderProgress = newUploaderProgress
-        maxProgress = Math.max(maxProgress, newUploaderProgress)
-      }
+    // Verify progress is monotonically increasing
+    if (i > 0) {
+      expect(chunk.progressPercentage).toBeGreaterThanOrEqual(
+        chunks[i - 1].progressPercentage,
+      )
     }
 
-    // Break if both have made significant progress or completed
-    if (downloaderProgress >= 50 && uploaderProgress >= 50) {
-      break
+    // For the final chunk, ensure we reach exactly 100%
+    if (chunk.final) {
+      expect(chunk.progressPercentage).toBe(100)
     }
 
-    await downloaderPage.waitForTimeout(200)
-    progressChecks++
+    // Verify progress percentage is reasonable (0-100%)
+    expect(chunk.progressPercentage).toBeGreaterThanOrEqual(0)
+    expect(chunk.progressPercentage).toBeLessThanOrEqual(100)
   }
+}
 
-  return {
-    uploaderProgress,
-    downloaderProgress,
-    maxProgress,
-  }
-}
\ No newline at end of file