feat: improve TypeScript diagnosis plugin

[GRAMMAC1]

Summary

• Expand the built-in TypeScript plugin from a simple TS-code detector into structured diagnostic parsing.
• Extract TypeScript diagnostic code, message, file, line, column, and coarse failure kind for common frontend failures.
• Generate more focused summaries and next-step suggestions for module resolution, assignability, missing property/name, JSX config, project config, type definitions, and implicit any cases.
• Support Vue SFC diagnostics emitted by vue-tsc.
• Extract shared firstNonEmptyLine utility for aggregate and generic plugin code.
• Add TypeScript plugin tests for TSX module resolution, TSX assignability, and Vue SFC diagnostics.

Validation

• pnpm verify
• pre-commit Biome check during commit

Note: the sandboxed verify run passed check/lint/typecheck/tests but failed at the harness step because tsx could not create its IPC pipe under the sandbox. The non-sandbox rerun passed.