Include inline source files in --save-expectations

[ksss]

Summary

When a target is configured with inline: true, steep check --save-expectations produced an empty YAML (--- []) even when diagnostics were reported, because the inline source files were not collected into all_files.

print_typecheck_result was iterating over target.source_pattern and target.signature_pattern only, missing target.inline_source_pattern. This change adds the missing iteration so inline source files participate in both the populate and prune logic of save_expectations.

Repro

# Steepfile
target :app do
  check "lib", inline: true
end

# lib/foo.rb
1 + "2"

$ steep check --save-expectations
$ cat steep_expectations.yml
--- []

With this fix, steep_expectations.yml correctly contains the lib/foo.rb entry with its diagnostics.

Test plan

• bundle exec ruby -Itest test/cli_test.rb -n test_check_inline_save_expectations
• Confirmed the new test fails on master and passes with the fix

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