v1.3.33: Configurable Breadcrumb Count

User-requested feature: Choose between 1 or 4 breadcrumbs!

New Features:

• ⚙️ Radio buttons in popup for mode selection
• 1️⃣ Single breadcrumb mode: Only shows active tab indicator (🟦)
• 4️⃣ Four breadcrumb mode: Full MRU trail (🟦🟩🟧🟥)
• 💾 Settings persist via chrome.storage.sync
• 🔄 Real-time updates when settings change
• 👁️ Visual indicators in popup showing what each mode looks like

Why This Matters:
Not everyone needs to see 4 indicators at all times. This release gives users flexibility to choose the UI that works best for them.