Doom Meter Trend Graph (Stock Price Style)

[PipFoweraker]

Summary

Add a trend visualization to the doom meter showing doom over time, similar to a stock price graph.

Related to: #500 (Research Quality System) - broader risk/doom system redesign

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Feature Description

Players currently see doom as a single number. Add a small trend graph that shows:

• Doom value over the last N turns (10-20 turns?)
• Comparison line showing the baseline doom trajectory (now that baseline scoring exists)
• Visual indication of whether player is above/below baseline trend

Why This Matters

• Helps players understand the trend of their decisions, not just current state
• Aligns with "big number going up/down" intuition (Path of Exile / Path of Building style)
• Prepares UI for future risk system where doom spikes from events will be visible in the graph

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UI Mockup Concept

DOOM: 47 ▲
┌────────────────────────┐
│    ╱╲                  │  <- Your doom (solid line)
│   ╱  ╲    ╱╲          │
│  ╱    ╲__╱  ╲___╱     │
│ ╱                      │
│╱ · · · · · · · · · · · │  <- Baseline (dotted line)
└────────────────────────┘
  Turn 1        Turn 20

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Implementation Notes

• Could reuse charting approach if one exists, or simple custom draw
• Should be compact enough to fit in existing doom meter area
• Consider: hover to see exact values? Click to expand?

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Success Criteria

• Doom trend visible over last N turns
• Baseline comparison line shown
• Graph updates each turn
• Fits within existing UI layout