fix: prevent stale cache when editing prompts across multiple windows

[hannesrudolph]

Summary

Fixes a bug where the context condensing prompt (and mode prompts) would revert to a previous value when multiple VS Code windows are open. This occurred because each window had its own stale cache of the global state, and read-modify-write operations would overwrite newer values from other windows.

Changes

• Add refreshGlobalStateKey() method to ContextProxy that reads fresh values directly from VS Code's globalState and updates the local cache
• Update updateCondensingPrompt handler to use refreshGlobalStateKey() before modifying customSupportPrompts
• Update updatePrompt handler to use refreshGlobalStateKey() before modifying customModePrompts
• Add unit tests for the new refreshGlobalStateKey() method

Root Cause

Each VS Code window runs its own extension host process with a separate ContextProxy singleton. The cache was populated at initialization but never refreshed when other windows updated globalState. This caused stale values to be used in read-modify-write operations.

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Important

Fixes stale cache issue in VS Code extension by adding refreshGlobalStateKey() to update cache from globalState, ensuring consistency across multiple windows.

• Behavior:
  • Fixes stale cache issue in ContextProxy when editing prompts across multiple VS Code windows.
  • Introduces refreshGlobalStateKey() in ContextProxy to update cache from globalState.
  • Updates updateCondensingPrompt and updatePrompt handlers in webviewMessageHandler.ts to use refreshGlobalStateKey().
• Tests:
  • Adds unit tests for refreshGlobalStateKey() in ContextProxy.spec.ts.

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Re-review complete. No issues flagged in the net-new diff.

• No issues flagged in this review

Previous reviews

• 813a909: Review #1

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