Track additional GitHub Copilot context commands (#terminalLastCommand, #clipboard, etc.)

[Copilot]

Adds detection and counting for 6 context commands that were previously untracked: #terminalLastCommand, #terminalSelection, #clipboard, #changes, #outputPanel, #problemsPanel.

Changes

Core detection (src/extension.ts)

• Extended ContextReferenceUsage interface with 6 new fields
• Added regex patterns to analyzeContextReferences() for new context commands
• Updated initialization and merge logic across 5 locations

UI display (src/webview/*/main.ts)

• Usage dashboard: Added stat cards with icons and tooltips for each new command
• Diagnostics panel: Updated totals and summary tooltips (abbreviated format: #termLC, #clip, etc.)
• Log viewer: Added badges for new references in per-interaction views
• Updated getTotalContextRefs() functions to include new fields in all three webviews

Type definitions

• Synchronized ContextReferenceUsage type across all webview files to include new fields

Documentation

• Updated TRACKABLE-DATA.md with complete context command reference list
• Updated USAGE-ANALYSIS.md with usage patterns and optimization tips for new commands

All context references now consistently tracked across detection, aggregation, and display layers.

Original prompt

i want to detect all context # commands and show them as context refs in all locations. Examples are #terminalLastCommand and #terminalSelection . Find other examples in the docs, but only add context references to the list. make sure to count these in all places where we show them

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