refactor tag input dialog form to use typed reactive forms (fixes #9291)

[Saby-Bishops]

Summary

• migrate PlanetTagInputDialogComponent to use typed form controls and groups
• add tag form control aliases and update validators to accept typed controls
• reference typed controls when resetting validation and submitting the form

Testing

• npm run lint -- planet-tag-input-dialog (fails: ng CLI is not available in the container)

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https://chatgpt.com/codex/tasks/task_e_6904fe7bd558832da024dfbb94b8746e