Fix Tailwind CSS styling configuration

- Add tailwind.config.ts with proper content paths and theme config
- Add postcss.config.js for Tailwind and autoprefixer processing
- Downgrade tailwindcss to v3.4.17 and add missing PostCSS dependencies
- Update Dockerfile to clarify build process
- Fix UI styling issues in Docker environment

lib/tradingview.ts

@@ -196,7 +196,10 @@ export class TradingViewCapture {
         
         if (emailButton.asElement()) {
           console.log('Found email login button, clicking...')
-          await emailButton.asElement()?.click()
+          const elementHandle = emailButton.asElement() as any
+          if (elementHandle) {
+            await elementHandle.click()
+          }
           await new Promise(res => setTimeout(res, 2000))
           await this.debugScreenshot('login_04b_after_email_button', page)
           
@@ -233,7 +236,7 @@ export class TradingViewCapture {
             const text = btn.textContent?.toLowerCase() || ''
             return text.includes('sign in') || text.includes('login') || text.includes('submit')
           })
-        }).then(handle => handle.asElement())
+        }).then(handle => handle.asElement()) as any
       }
       
       if (!signInButton) {