feat: confirm pharmacy deletion and migrate models

[Roman-Andr]

Impact

• adds a per-pharmacy delete button on the right side of every row
• requires a second click within five seconds: the cross changes to a check mark, then resets if deletion is not confirmed
• removes the selected pharmacy instead of only the final row
• migrates all production and test data models from dataclasses to Pydantic models
• preserves immutable model behavior with frozen models and rejects unknown fields

Root cause

Pharmacy rows had no targeted delete action or confirmation state; the only existing action removed the last row immediately. Structured models were also split between Pydantic and dataclasses, which left validation and copy semantics inconsistent across the application.

Validation

• uv lock --check
• uv run ruff check .
• uv run mypy
• env -u DISPLAY -u WAYLAND_DISPLAY uv run pytest - 330 passed, 16 GUI tests skipped locally because Xvfb is unavailable
• uv run pyinstaller --noconfirm pharmparser.spec
• ./dist/pharmparser-cli --help

Screenshots

A local screenshot is not attached because this release environment has no working display server or Xvfb. The delete-button behavior has unit and GUI regression coverage; the GitHub Linux job runs the GUI suite under Xvfb.

Release workflow note

This supersedes #19. GitHub reported the shared dev history as rebaseable: false because it contains merge commits. This branch is based directly on the same main SHA and its tree is byte-for-byte identical to the checked dev head, allowing the required rebase merge without rewriting dev.