install `aider` and `playwright` with `uv`

Only half-answered in the bug tracker, so the full answer is, firstly install playwright in to the aider uv-managed virtualenv:

$ uv tool install --with playwright --with pip  --force --python python3.12 aider-chat@latest

and then install playwright's browser stuff:

$ ~/.local/share/uv/tools/aider-chat/bin/playwright install --with-deps chromium