feat: Enhance context settings with validation and UI options

- Added ContextConfig interface and loadContextConfig function to manage context settings.
- Implemented validation for context settings in WorkerService.
- Updated Sidebar component to include new context settings for token economics, observation filtering, display configuration, and feature toggles.
- Introduced default settings for new context features.
- Adjusted types to accommodate new settings in the application state.

src/ui/viewer/constants/settings.ts

@@ -6,4 +6,23 @@ export const DEFAULT_SETTINGS = {
   CLAUDE_MEM_MODEL: 'claude-haiku-4-5',
   CLAUDE_MEM_CONTEXT_OBSERVATIONS: '50',
   CLAUDE_MEM_WORKER_PORT: '37777',
+
+  // Token Economics (all true for backwards compatibility)
+  CLAUDE_MEM_CONTEXT_SHOW_READ_TOKENS: 'true',
+  CLAUDE_MEM_CONTEXT_SHOW_WORK_TOKENS: 'true',
+  CLAUDE_MEM_CONTEXT_SHOW_SAVINGS_AMOUNT: 'true',
+  CLAUDE_MEM_CONTEXT_SHOW_SAVINGS_PERCENT: 'true',
+
+  // Observation Filtering (all types and concepts)
+  CLAUDE_MEM_CONTEXT_OBSERVATION_TYPES: 'bugfix,feature,refactor,discovery,decision,change',
+  CLAUDE_MEM_CONTEXT_OBSERVATION_CONCEPTS: 'how-it-works,why-it-exists,what-changed,problem-solution,gotcha,pattern,trade-off',
+
+  // Display Configuration
+  CLAUDE_MEM_CONTEXT_FULL_COUNT: '5',
+  CLAUDE_MEM_CONTEXT_FULL_FIELD: 'narrative',
+  CLAUDE_MEM_CONTEXT_SESSION_COUNT: '10',
+
+  // Feature Toggles
+  CLAUDE_MEM_CONTEXT_SHOW_LAST_SUMMARY: 'true',
+  CLAUDE_MEM_CONTEXT_SHOW_LAST_MESSAGE: 'false',
 } as const;