Release v1.0.0: Hybrid AI Architecture, Modern UI Overhaul, and Performance Optimizations

# 🚀 Major Features: Hybrid AI Architecture
- **Dual-Brain System**: Implemented "Primary Brain" (GPT-4o/Gemini) for complex reasoning and "Acceleration Layer" (Groq/Llama-3) for fast tool execution.
- **Model Allowlist**: Integrated `MODEL_OPTIONS` in `config.py` with tiered selection (Efficiency vs. Flagship).
- **Fast Mode**: Added toggle to offload heavy tasks (Scout/Navigator) to Groq/Llama-3-70B, reducing costs and latency.

# 🎨 UI/UX: Modern Redesign & Workflow
- **Settings Modal Revamp**:
- Redesigned with a "Purple/Gradient" theme for a professional look.
- Split configuration into "Services", "Primary Brain", and "Acceleration" tabs.
- Implemented **Passive Validation**: API keys are validated instantly on blur (Zero-cost check).
- Dynamic visibility: Automatically hides redundant keys based on provider selection.
- **Dashboard Layout**:
- Vertical control bar in the header for better space utilization.
- Repositioned "Stop & Back" button to the right column for better accessibility.
- Enforced white-card styling (`live-report-wrapper`) for Full Reports in Step 3

services/planner_service.py

@@ -565,7 +565,7 @@ class PlannerService:
 
             #print(f"task_list_input: {task_list_str}")
 
-            message = f"Plan this trip: {task_list_str}"
+            message = task_list_str
 
             while attempt < max_retries and not success:
                 attempt += 1