feat: Add debug mode with screenshot and page analysis

Features:
- Wait for user ENTER in visible mode (GEMINI_BROWSER_VISIBLE=true)
- Save screenshot to /tmp/gemini-debug.png
- Save HTML to /tmp/gemini-debug.html
- JavaScript-based element detection
- Multi-strategy wait (A: selectors, B: time, C: JS, D: debug)
- Detailed logging of each strategy attempt
- Page structure dump in debug mode

This helps identify why input field is not found

internal/providers/geminiweb/playwright_provider.go

@@ -134,10 +134,46 @@ func (p *PlaywrightProvider) Generate(ctx context.Context, model string, message
 		}
 	}
 
-	// 3. 等待頁面完全載入（project-golem 策略）
+	// 3. 調試模式：如果可見，等待用戶確認
+	if p.cfg.GeminiBrowserVisible {
+		fmt.Println("\n" + strings.Repeat("=", 60))
+		fmt.Println("DEBUG MODE: Browser is visible")
+		fmt.Println("Please check the browser and press ENTER when ready...")
+		fmt.Println("If you see login page, please log in first")
+		fmt.Println(strings.Repeat("=", 60))
+
+		// 等待用戶按 Enter
+		var input string
+		fmt.Scanln(&input)
+
+		// 截圖保存
+		screenshotPath := "/tmp/gemini-debug.png"
+		if _, err := p.page.Screenshot(playwright.PageScreenshotOptions{
+			Path: playwright.String(screenshotPath),
+		}); err == nil {
+			fmt.Printf("[GeminiWeb] Screenshot saved to: %s\n", screenshotPath)
+		}
+
+		// 輸出頁面信息
+		fmt.Printf("[GeminiWeb] Current URL: %s\n", p.page.URL())
+		if title, err := p.page.Title(); err == nil {
+			fmt.Printf("[GeminiWeb] Page Title: %s\n", title)
+		}
+	}
+
+	// 4. 等待頁面完全載入（project-golem 策略）
 	fmt.Println("[GeminiWeb] Waiting for page to be ready...")
 	if err := p.waitForPageReady(); err != nil {
 		fmt.Printf("[GeminiWeb] Warning: %v\n", err)
+
+		// 額外調試：輸出頁面 HTML 結構
+		if p.cfg.GeminiBrowserVisible {
+			html, _ := p.page.Content()
+			debugPath := "/tmp/gemini-debug.html"
+			if err := os.WriteFile(debugPath, []byte(html), 0644); err == nil {
+				fmt.Printf("[GeminiWeb] HTML saved to: %s\n", debugPath)
+			}
+		}
 	}
 
 	// 4. 檢查登入狀態
@@ -211,46 +247,101 @@ func (p *PlaywrightProvider) waitForPageReady() error {
 		Timeout: playwright.Float(5000),
 	})
 
-	// 2. 等待輸入框出現（關鍵！）
+	// 2. 嘗試多種等待策略
 	inputSelectors := []string{
 		".ProseMirror",
 		"rich-textarea",
 		"div[role='textbox']",
 		"div[contenteditable='true']",
 		"textarea",
+		"input[type='text']",
 	}
 
-	var lastErr error
+	// 策略 A: 等待任一輸入框出現
-	for _, sel := range inputSelectors {
+	for i, sel := range inputSelectors {
-		fmt.Printf("  Checking for: %s\n", sel)
+		fmt.Printf("  [%d/%d] Waiting for: %s\n", i+1, len(inputSelectors), sel)
-		locator := p.page.Locator(sel)
-		if err := locator.WaitFor(playwright.LocatorWaitForOptions{
-			Timeout: playwright.Float(10000),
-			State:   playwright.WaitForSelectorStateVisible,
-		}); err == nil {
-			fmt.Printf("  ✓ Input field found: %s\n", sel)
-			return nil
-		} else {
-			lastErr = err
-		}
-	}
-
-	// 3. 如果都找不到，給頁面更多時間
-	fmt.Println("[GeminiWeb] Input not found immediately, waiting longer...")
-	time.Sleep(3 * time.Second)
-
-	for _, sel := range inputSelectors {
 		locator := p.page.Locator(sel)
 		if err := locator.WaitFor(playwright.LocatorWaitForOptions{
 			Timeout: playwright.Float(5000),
 			State:   playwright.WaitForSelectorStateVisible,
 		}); err == nil {
-			fmt.Printf("  ✓ Input field found after wait: %s\n", sel)
+			fmt.Printf("  ✓ Input field found: %s\n", sel)
 			return nil
 		}
 	}
 
-	return fmt.Errorf("input field not ready: %w", lastErr)
+	// 策略 B: 等待頁面完全載入
+	fmt.Println("[GeminiWeb] Waiting for page load...")
+	time.Sleep(3 * time.Second)
+
+	// 策略 C: 使用 JavaScript 檢查
+	fmt.Println("[GeminiWeb] Checking with JavaScript...")
+	result, err := p.page.Evaluate(`
+		() => {
+			// 檢查所有可能的輸入元素
+			const selectors = [
+				'.ProseMirror',
+				'rich-textarea',
+				'div[role="textbox"]',
+				'div[contenteditable="true"]',
+				'textarea',
+				'input[type="text"]'
+			];
+			
+			for (const sel of selectors) {
+				const el = document.querySelector(sel);
+				if (el) {
+					return {
+						found: true,
+						selector: sel,
+						tagName: el.tagName,
+						className: el.className,
+						visible: el.offsetParent !== null
+					};
+				}
+			}
+			
+			return { found: false };
+		}
+	`)
+
+	if err == nil {
+		if m, ok := result.(map[string]interface{}); ok {
+			if found, _ := m["found"].(bool); found {
+				sel, _ := m["selector"].(string)
+				fmt.Printf("  ✓ JavaScript found: %s\n", sel)
+				return nil
+			}
+		}
+	}
+
+	// 策略 D: 調試模式 - 輸出頁面結構
+	if p.cfg.GeminiBrowserVisible {
+		fmt.Println("[GeminiWeb].dump: Page structure analysis")
+		_, _ = p.page.Evaluate(`
+			() => {
+				const allElements = document.querySelectorAll('*');
+				const inputLike = [];
+				for (const el of allElements) {
+					if (el.contentEditable === 'true' || 
+						el.role === 'textbox' || 
+						el.tagName === 'TEXTAREA' ||
+						el.tagName === 'INPUT') {
+						inputLike.push({
+							tag: el.tagName,
+							class: el.className,
+							id: el.id,
+							role: el.role,
+							contentEditable: el.contentEditable
+						});
+					}
+				}
+				console.log('Input-like elements:', inputLike);
+			}
+		`)
+	}
+
+	return fmt.Errorf("no input field found after all strategies")
 }
 
 // isLoggedIn 檢查是否已登入