replace hardcoded tokenCount with live tool invocation count

[JeremyDev87]

Summary

Closes #490

The StageHealthBar footer was hardcoded to always display tokens: 0, which is meaningless because the MCP server acts only as a tool provider and cannot access LLM API token usage metadata.

This PR replaces the token count display with the actual number of tool invocations, accumulated via the existing TOOL_INVOKED event stream.

Changes

New behavior

• Footer now displays tools: <count> instead of tokens: 0
• Count increments by 1 on every TOOL_INVOKED event
• Values ≥ 1,000 are abbreviated as 1k, 2k, etc. (existing logic retained)

Renamed symbols

Before	After	Location
DashboardState.tokenUsage	toolInvokeCount	dashboard-types.ts
StageHealthBarProps.tokenCount	toolCount	StageHealthBar.tsx
formatStageHealthBar param tokenCount	toolCount	stage-health.pure.ts
Internal variable tokenStr	countStr	StageHealthBar.tsx, stage-health.pure.ts
Label tokens:	tools:	StageHealthBar.tsx

Implementation

• Added toolInvokeCount: number field to DashboardState interface
• Initialized to 0 in createInitialDashboardState()
• Incremented by 1 in the TOOL_INVOKED reducer case
• Passed as toolCount prop from DashboardApp to StageHealthBar

Test Plan

• New reducer test: toolInvokeCount increments from 0 → 1 → 2 on consecutive TOOL_INVOKED dispatches
• All existing StageHealthBar, stage-health.pure, use-dashboard-state, and dashboard-types tests updated and passing
• No residual references to tokenCount, tokenUsage, or tokenStr in the TUI source tree
• 164 test files, 3,783 tests pass
• TypeScript build succeeds

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Feb 18, 2026 2:18am