Fix just recipes on Windows

[floze-the-genius]

Summary

• replace hardcoded .venv/bin tool paths with uv run --no-sync so uv resolves bin versus Scripts cross-platform
• quote repository and Electron paths passed through shell recipes
• preserve the existing pre-synced environment behavior without refreshing uv.lock

Fixes #423

Significant AI assistance was used to prepare this change. The implementation was reviewed through the focused recipe expansions and checks listed below.

Tests

• just test (502 passed, 1 skipped)
• just check-migrations
• uv run --no-sync pre-commit run --files justfile
• dry-run expansion of every affected Python/pre-commit/Alembic/release recipe

Checklist

• I have read the Contributing guide.
• I have installed and tested the application for my platform (just dev).
• The test suite passes locally (just test).
• Pre-commit hooks are installed and pass (just precommit).
• I have added or updated tests where appropriate.
• I have updated the documentation / docstrings where appropriate. (Not applicable: recipe-only fix.)
• If my change touches the schema (tuttle/model.py), I generated and reviewed an Alembic migration (just migrate "<msg>"). (Not applicable: no schema changes.)
• If my change affects the graphical user interface, I have provided screenshots. (Not applicable: no UI changes.)
• I understand and can explain all submitted changes; if AI assistance was significant, I have disclosed it in the summary above.