feat: add honest connector telemetry runtime handling

[tnunamak]

Summary

• add truthful connector result classification in the runtime
• surface partial connector outcomes distinctly in the desktop UI
• wire the shared honest telemetry conformance corpus into data-connect's result-classifier tests
• fix native Tauri compilation by deriving Serialize for the connector result telemetry structs emitted to JSON
• fix Instagram source routing so instagram resolves to the Instagram source, not Instagram Ads

Validation

• cargo check --manifest-path src-tauri/Cargo.toml
• node playwright-runner/result-classifier.test.cjs
• npm run test:honest-telemetry-conformance
• npx vitest run src/lib/platform/utils.test.ts src/lib/platform/registry.test.ts src/pages/source/use-source-overview-page.test.ts

Notes

• this PR does not change production connector publication; it consumes the already-promoted honest telemetry contract semantics
• the Instagram/Instagram Ads follow-up fix is in the same branch so local import history and source overview routing stay coherent