Add Wispr-style text transforms

[spandan-appointy]

Summary

• Add a Polish base action and up to 9 transform shortcut slots.
• Seed Prompt Engineer, Turn into a List, Translate to English, Empathize, and Make More Concise prompts.
• Transform selected text in place with shortcut conflict checks and selection/target safeguards.
• Add automatic Polish after Groq dictation with fallback to the original transcription.
• Use structured prompts that preserve intent, formatting, URLs, and technical terms.

Verification

• Unsigned Debug build passes.
• Unsigned App Store build passes.
• git diff --check passes.