feat: add AI-driven portfolio rebalancing with historical comparison …

[d3v-active]

this pr closes #346

Description

This PR implements a comprehensive, premium Portfolio Rebalancer in the Stellar Developer Dashboard. It enables users to analyze their current asset allocations, define target allocations using interactive inputs or AI presets, receive dynamic AI-driven insights, compare historical performance, and execute rebalancing trades with a single click.

Key Features

1. Current Allocation Analysis

   • Renders a detailed breakdown of the user's current token holdings, prices, and values.
   • Displays a side-by-side visual comparison (Current % vs. Target %) using progress bars for each asset.

2. Interactive Target Allocation Input

   • Replaced the simple text area with interactive sliders and number inputs for each asset.
   • Added AI Presets (Conservative, Moderate, Aggressive, Yield-Optimized) to quickly populate target allocations.
   • Included an Auto-balance button that normalizes target weights to sum to exactly 100%.
   • Allowed users to add new assets (e.g. USDC, AQUA, BTC, ETH) with pre-configured Stellar testnet issuer addresses.

3. AI-Driven Insights & Recommendations

   • Calculates the portfolio's Herfindahl-Hirschman Index (HHI) to generate a Diversification Score (0-100).
   • Identifies concentration risks (assets representing >40% of the portfolio).
   • Generates natural language AI Reasoning explaining the benefits of the target allocation (volatility impact, risk profile, and rebalancing priorities).

4. Historical Performance Comparison

   • Fetches historical daily prices from CoinGecko (with a robust random-walk fallback for offline/rate-limited states).
   • Simulates the growth of $10,000 invested under the Current Allocation vs. the Target Allocation over the selected timeframe (7D, 30D, 90D).
   • Displays an interactive Recharts line chart comparing the cumulative returns (ROI %) of both strategies.

5. One-Click Execution

   • Summarizes the exact list of trades (buy/sell amounts in USD and token units) required to reach the target allocation.
   • Simulated/Mock Execution: Executes the rebalance locally and updates the Zustand store's accountData.balances so the entire dashboard instantly reflects the new portfolio balances.
   • Live Stellar Execution: Allows users to input their Secret Key (S...) to build, sign, and submit a live transaction to the Horizon network using manageSellOffer operations routed through XLM.

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