Customize compaction behavior

[ckelly17]

Summary

• Adds a Compaction Options picker to the token-counter popover in the chat input bar, letting users choose how the conversation is compacted before triggering it manually
• The default strategy is theme-configurable via defaultCompactionStrategy ("SUMMARY" | "TOOL_PRUNE" | "AUTO") and initializes the picker on room load
• Strategies are exposed under a collapsible Compaction Options section with labeled radio buttons and info tooltips explaining each approach; the top-level Compact button triggers compaction immediately with the selected strategy

What's included

• CompactStrategyPicker inline component in room-input.tsx — single Compact button + collapsible strategy radio group
• compactionStrategy state in room-content.tsx seeded from root.theme.defaultCompactionStrategy
• compactMessages(strategy?) in room.store.ts passes the chosen strategy to the pixel (compactionTypes=["<strategy>"]); omits the param when strategy is AUTO
• defaultCompactionStrategy wired through ThemeMap → root.store.ts → component state

Test plan

• Open a room; token counter appears when tokens are in use
• Hover the token pie chart — popover opens with a Compact button and collapsed Compaction Options
• Expand Compaction Options — three radio buttons (Summarize, Prune Tools, Auto) with tooltip icons
• Select a strategy, click Compact — toast confirms success; conversation is compacted with the chosen method
• Set defaultCompactionStrategy: "TOOL_PRUNE" in theme.local.json, restart dev server — picker initializes to Prune Tools
• Verify send button and chat input are never disabled or replaced due to token usage

[snyk-io]

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[tevanburen]

Waiting on #3528 and #3529 btw

[tevanburen]

should also add to the theme map editor page in /client