Fix Dart 3.10 dot-shorthand compatibility in stacked_generator

[Eimen2018]

Summary

• migrate generator core to analyzer 8 / source_gen 4 APIs required for modern Dart toolchains
• fix forms generation to sanitize executable references so we never emit invalid leading-dot symbols (for example, .validator)
• align logger/get_it behavior and update tests for current dependency/runtime behavior
• stabilize brittle snapshot-style tests to assert behavior where formatting-only differences were causing failures

Validation

• dart analyze (no errors/warnings; infos only)
• dart test (passes in packages/generator)
• external repro for dot-shorthand issue using Dart 3.10 syntax now succeeds with local patched generator (dart run build_runner build -d)

Commits

1. chore(generator): migrate core to analyzer 8/source_gen 4 for Dart 3.10
2. fix(forms): sanitize generated executable refs for dot-shorthand syntax
3. test(generator): stabilize suites for current analyzer/get_it/logger toolchain

Refs: Stacked-Org/stacked#1180

[github-actions]

LCOV of commit e41f8ca during Test Package #195

Summary coverage rate:
  lines......: 64.8% (1618 of 2497 lines)
  functions..: no data found
  branches...: no data found

Files changed coverage rate: n/a

Full coverage report

[FilledStacks]

LGTM. Happy to see they removed the name3 property again.

[FilledStacks]

🎉 This PR is included in version 1.6.2 🎉

The release is available on:

• v1.6.2
• GitHub release

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