fix: getPossibleTargets select correct targets

[C4illin]

Summary by cubic

Fix selection of available targets for each input format by correctly building the possibleTargets map. This prevents wrong or empty target lists returned by getPossibleTargets.

• Bug Fixes
  • Only build targets when both from and to lists exist.
  • Map each from extension to the exact to list for that converter.
  • Minor cleanup: early-continue checks, clearer vars, removed unused getPossibleInputs and dead comments.

^{Written for commit 0df7f7a. Summary will update automatically on new commits.}

[cubic-dev-ai]

No issues found across 1 file

[SAHIL-Sharma21]

PR looks good.