Address PR-review findings for Cost View and Copilot prompt parsing

[Copilot]

Bug Fix

What was the bug?

This branch still had unresolved review findings after introducing Cost View and Copilot prompt-export parsing. The follow-up request was to run PR review and close all actionable issues.

How did you fix it?

• Dead-code cleanup in cost analysis

  Removed unused recommit constants/fields from src/lib/costAnalysis.js so analysis output only contains consumed fields.

• Cost View copy aligned to actual behavior

  Updated Cost View helper text in src/components/CostView.jsx to consistently describe cache misses.

• Parser truncation correctness + clarity

  Refined truncation logic in src/lib/copilotCostParser.ts to guarantee display strings cap at the intended length (including ellipsis), and renamed constants/helpers for display-specific intent.

• Missing coverage added

  Added src/__tests__/costView.test.jsx and extended src/__tests__/copilotCostParser.test.ts with a long-prompt truncation regression case.

const MAX_DISPLAY_TEXT_LENGTH = 4000;

function truncateForDisplay(text: string): string {
  if (text.length <= MAX_DISPLAY_TEXT_LENGTH) return text;
  const visibleLength = Math.max(MAX_DISPLAY_TEXT_LENGTH - 1, 0);
  if (visibleLength === 0) return "…";
  return text.slice(0, visibleLength) + "…";
}

Testing

Scope includes targeted regression coverage for:

• Cost View rendering (empty state + cache-miss annotation path)
• Copilot prompt parser display truncation boundary behavior

[Copilot]

Pull request overview

This PR closes prior review findings around the new Cost View and Copilot prompt-export parsing by tightening cost/token accounting, improving copy/format support strings, expanding model pricing coverage, and adding regression tests.

Changes:

• Adds Cost View UI + supporting aggregation logic (per-call spend, cache miss heuristics, context composition).
• Adds VS Code Copilot prompt-export parsing (“copilot-prompts”) with display-safe truncation + metadata totals.
• Expands pricing support to OpenAI/Copilot models and improves model-name normalization; adds targeted tests and docs updates.

Show a summary per file

File	Description
src/lib/sessionTypes.ts	Extends SessionFormat with copilot-prompts.
src/lib/sessionParsing.ts	Updates parse failure “supported formats” message.
src/lib/pricing.js	Adds OpenAI/Copilot pricing, normalizes model names, adjusts cached-input cost calculation.
src/lib/pricing.d.ts	Adds TS declarations for pricing.js exports.
src/lib/parseSession.ts	Routes detection/parsing for Copilot prompt-export JSON.
src/lib/costAnalysis.js	Adds per-call cost/context/cache-miss aggregation helpers for Cost View.
src/lib/copilotCostParser.ts	Implements prompt-export parser, usage extraction, context breakdown, truncation behavior.
src/lib/commandPalette.js	Registers “Cost View” in the command palette.
src/hooks/useKeyboardShortcuts.js	Adds keyboard shortcut 6 for Cost View and shifts Coach to 7.
src/components/ShortcutsModal.jsx	Updates shortcuts legend to match new view ordering.
src/components/CostView.jsx	Adds Cost View UI (summary cards + cost/context bars + cache miss annotations).
src/components/app/constants.js	Registers cost in APP_VIEWS.
src/App.jsx	Lazy-loads and renders Cost View for activeView === "cost".
src/tests/pricing.test.js	Updates pricing expectations and adds cached-input + normalization + GPT pricing tests.
src/tests/keyboardShortcuts.test.js	Verifies new view shortcut mapping (6=cost, 7=coach).
src/tests/costView.test.jsx	Adds Cost View rendering coverage (empty + cache-miss annotation).
src/tests/costAnalysis.test.js	Adds unit tests for cost analysis aggregation + cache miss detection.
src/tests/copilotCostParser.test.ts	Adds parser routing/normalization tests + truncation regression coverage.
src/tests/autonomyMetrics.test.js	Adjusts cost estimation expectations for priced vs unpriced non-Claude models.
README.md	Updates feature description, view list, shortcuts, formats table, and adds Cost View section.
CLAUDE.md	Updates architecture/file tree references for Cost View and prompt-export parser.

Copilot's findings

• Files reviewed: 20/21 changed files
• Comments generated: 7