(MOT-4101) fix(console): show function-call params the UI was dropping

[ytallo]

Summary

• Preserve executed function-call arguments across wrapper unwrapping, approval updates, and degraded transcript snapshots.
• Fall back to the raw request pane when a specialized tool preview cannot parse the request.
• Add regression coverage for flattened and stringified payloads, snapshot preservation, empty-input detection, and shell preview fallbacks.

Why

The console could show request · empty, or no arguments at all for a held call, even though the backend executed the call with full arguments. Transcript mapping dropped some wrapper payload shapes, and preview renderers could suppress the raw-request fallback before confirming that they had a renderable request.

Impact

Function-call cards now keep reviewable arguments visible and accurately reflect what was executed, including calls waiting for approval.

Validation

• pnpm test -- src/lib/sessions/entry-mapper.test.ts src/components/chat/shell/__tests__/preview-contract.test.ts (79 files, 1,036 tests passed)
• pnpm typecheck
• Biome check on all 11 changed files

The repository-wide lint command still reports pre-existing issues in files outside this diff.

Fixes MOT-4101

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[github-actions]

skill-check — worker

0 verified, 46 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.

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