feat(studio): add Tessera fair-value preset and staleness chip

[92Infinitus92]

Pairs with LimeChain/surfpool#11 (the create_tessera_fair_value_scenario tool and the tessera templates) — merge after it, the preset needs that backend.

Stacked on #9 — reuses its string-values scenarios API, the constant-catalog fetch and the MCP creator seam.

• "PMM fair value" preset: market picker fed by the 26-pair catalog (free-text address fallback when the catalog fails to load), price input, and creation through the create_tessera_fair_value_scenario MCP tool — no client-side math, the backend derives both ratio fields.
• "Tessera Stale Quote" AI chip, goal-level like every other protocol's chip; the procedure lives in the backend template's llm_context.
• Three file-internal phoenix helpers are generalized instead of duplicated (scenarioTemplate, createScenarioWithMcpTool, ScenarioCreationResult) — expect a small, mechanical conflict on those lines when this merges alongside the phoenix branch.
• 317 tests green, tsc clean.

Greptile Summary

The PR adds a Tessera fair-value scenario preset and a Tessera stale-quote AI example, relying on the explicitly paired Surfpool backend change.

• Adds a PMM dialog with catalog-backed market selection, free-text fallback, decimal-price validation, and MCP scenario creation.
• Adds Tessera protocol presentation across scenario presets, AI examples, icons, and the raw-layout scenario editor.
• Generalizes scenario-template lookup and MCP-backed scenario creation helpers.
• Extends tests for the new dialog, API adapter, icon, preset, and AI prompt behavior.

Confidence Score: 5/5

The PR appears safe to merge with its explicitly paired Surfpool backend change.

No blocking failure remains.

Important Files Changed

Filename	Overview
apps/studio/src/lib/scenarios-api.ts	Adds Tessera catalog loading and MCP-backed scenario creation while generalizing the existing template and MCP helper seams; no eligible blocking defect remains.
apps/studio/src/components/svm/pmm-fair-value-dialog.tsx	Implements catalog-backed market selection, free-text fallback, price validation, submission state, and backend error presentation.
apps/studio/src/components/svm/scenario-editor.tsx	Enables Tessera templates and derives editable fields from raw-layout metadata when an IDL account structure is unavailable.
apps/studio/src/components/svm/scenarios-bento.tsx	Integrates the new preset dialog into scenario creation, refresh, and editor navigation.
apps/studio/src/components/svm/scenarios-bento.types.ts	Adds the Tessera stale-quote example prompt and protocol association.

Sequence Diagram

sequenceDiagram
  actor User
  participant Dialog as PMM Fair-Value Dialog
  participant Studio as Studio Scenario API
  participant MCP as Surfpool MCP Server
  User->>Dialog: Open preset
  Dialog->>Studio: GET /v1/scenarios/templates
  Studio-->>Dialog: tessera-fair-value market catalog
  User->>Dialog: Select market and enter price
  Dialog->>MCP: create_tessera_fair_value_scenario
  MCP-->>Dialog: Scenario editor URL with id
  Dialog-->>User: Navigate to scenario editor

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_{Reviews (4): Last reviewed commit: "feat(studio): add Tessera fair-value pre..." | Re-trigger Greptile}

Context used:

• Knowledge Base — Studio scenarios and AI workflows

[github-actions]

• pmm-fair-value-dialog.tsx:80 — The empty initial catalog is treated as a failed catalog. While loading, users see free-text input and can submit any market before the catalog resolves, bypassing catalog-only validation. Track an explicit loading state and enable fallback only after loading finishes unsuccessfully.

[github-actions]

• scenarios-api.ts:171 — Blocking: The preset calls create_tessera_fair_value_scenario and expects tessera-fair-value, but the coupled Surfpool backend exposes neither contract. Catalog loading falls back to free text, then every creation attempt fails. Land/version the backend support before enabling this UI, or feature-detect the tool/template and hide the preset.

[github-actions]

• Medium — pmm-fair-value-dialog.tsx:46: canCreate remains true while marketOptions === null. After reopening, a previously selected market persists and can be submitted while the UI displays “Loading markets…”, bypassing catalog validation. Require catalog loading to finish before enabling creation, or reset market when opening.

[github-actions]

• scenario-editor.tsx:394: Raw Tessera u64/u128 fields are classified as numeric, then converted with Number(...) when edited. Atomic ratio values can exceed Number.MAX_SAFE_INTEGER, causing precision loss before saving. Preserve these values as decimal strings, consistent with the string-values API.