Introduce two new visualizations to the “Model Data Analysis” panel:
1. Model Consumption Trend (line chart)
• Added `spec_model_line` state and legend support.
• Calculates per-model counts over time and updates via `updateChartData`.
2. Model Call Ranking (bar chart)
• Added `spec_rank_bar` state with `seriesField` and legend enabled.
• Ranks models by total call count.
Additional changes:
• Extended tab navigation with two new `TabPane`s and adjusted chart rendering logic.
• Swapped icons/texts to match new chart purposes.
• Reused existing color mapping to ensure consistent palette.
No breaking changes; UI now offers richer insights into model usage patterns.
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