chore(release): finalize 0.6.6

[jmlago]

Finalize Telegram and telegram-editor 0.6.6 with matching Mix versions and dated release notes, including the ingress crash fix. The release includes the already merged #41, #42 and #43.

The immutable v0.6.6 tag points to this release commit. This PR brings the version and changelog stamps back into main.

Validation: Telegram 244 tests, 0 failures; editor 2 tests, 0 failures; formatted changed Mix files and git diff --check passed.

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📥 Commits

Reviewing files that changed from the base of the PR and between 249f908 and 29edec8.

📒 Files selected for processing (3)

• CHANGELOG.md
• editor/mix.exs
• mix.exs

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