feat(vs-extension): Load all views with a single CLI call instead of one per view

[Copilot]

Each tab navigation in the Visual Studio extension triggered a separate CLI process (usage --json, chart --json, usage-analysis --json, fluency --json), producing a spinner for every view the user visited.

CLI: new all --json command

cli/src/commands/all.ts — single process that runs all four data computations in parallel and emits one combined JSON payload:

{ "details": {...}, "chart": {...}, "usage": {...}, "fluency": {...} }

The three main stat passes (calculateDetailedStats, calculateDailyStats, calculateUsageAnalysisStats) run via Promise.all(); the in-memory session-file cache ensures each file is parsed only once across all three.

VS Extension: preload all views on startup

• CliBridge — GetAllDataAsync() calls all --json once, parses the envelope, and populates four independent view caches (_cachedStats, _cachedChartJson, _cachedUsageAnalysisJson, _cachedMaturity). In-flight deduplication ensures concurrent callers share a single process. The existing per-view Get*Async() methods now hit their respective caches first, falling back to individual CLI calls only when stale.

• TokenTrackerControl — PrewarmAllViewsAsync() replaces the single RefreshAsync() call in InitWebViewAsync(). It awaits GetAllDataAsync(), then builds and caches the HTML for all five views (details, chart, usage, environmental, maturity). Navigation between views after startup is instant — no per-view spinner.

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