fix(lint): preserve quoted foreign import paths

[vicmcorrea]

bend-lint refuses whole-file formatting when a quoted foreign import filename contains # or whitespace-bounded as. The import formatter treats those bytes as a comment or module alias, and the safety guard correctly rejects the changed path.

Use existing comment-token offsets to locate trailing comments and preserve literal paths during alias normalization. Add regressions for hashes, spaces, raw backslashes, trailing comments and LF/CRLF, plus a module path and alias named as. The tests stay in bend-lint's own suite, following the maintainer guidance in #1389.

Validation:

• All 115 bend-lint tests pass; the three foreign-path regressions fail on the original formatter.
• Actual --fix runs preserve both affected filenames under LF/CRLF, produce a clean second lint run, and preserve program output before/after formatting and in emitted JavaScript.
• Repository gate: 54/54; git diff --check passes.
• Two independent reviews found no actionable issues.

Typecheck still reports the same two pre-existing TS2339 errors as clean main, in bend2/bend.ts at lines 2040 and 3771. There are no new diagnostics.