feat: add compose draft window

[TimInTech]

Summary

• add a text-first Compose/Draft window for manual input and LLM rewriting
• support workflow and writing-preset selection without changing the speech/transcription path
• allow copy and explicit user-triggered insert via PasteService
• keep voice-routing as a disabled future hook for later Paket I phases

Scope

Included:

• new app/compose_window.py
• tray action / app-shell integration
• direct text path in LLMService
• explicit PasteService override for the manual insert action
• EN/DE i18n keys
• tests for compose behavior, i18n, LLM direct path, tray lifecycle, and paste override

Excluded:

• no voice-routing behavior
• no transcription/Whisper/AudioRecorder/hotkey rewrite
• no I-2 variant history
• no I-3 signature/name option
• no README, screenshot, or banner changes

Safety

• no automatic paste after LLM generation
• insert happens only after explicit user action
• copy uses QApplication clipboard
• dummy test token is not OpenAI-shaped
• no real secrets or sk-... dummy values

Tests

• python3 -m compileall app tests
• QT_QPA_PLATFORM=offscreen WHISPER_GUI_TESTS=1 python -m pytest -q — 322 passed
• git diff --check
• scope check: README/screenshots/generator unchanged
• secret check: no real key, no sk-... dummy

Roadmap

Project #10 item Paket I: Compose-/Entwurfsfenster (Text-First) [Flaggschiff] remains In Progress.
I-2 and I-3 stay out of scope.

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