feat: add latest Anthropic models

[dimavedenyapin]

Summary

• Add Claude Opus 5 and Claude Sonnet 5 to the Claude Code model roster, ordered after Claude Fable 5 based on Anthropic's latest models comparison.
• Normalize the display labels for the newest Claude entries.
• Derive CLI agent model counts from the exported model arrays instead of stale literals.

Test plan

• pnpm typecheck
• ./node_modules/.bin/vitest run src/renderer/src/types/index.test.ts

Notes: The normal pnpm test:run ... script could not run because Electron's postinstall binary was unavailable after the native install path failed on better-sqlite3 with Node 26. The direct Vitest command passed for the focused test.

Source: Anthropic Models overview (2026-07-27): https://platform.claude.com/docs/en/about-claude/models/overview