Add image paste functionality allowing users to paste images directly
from the clipboard as files. Uses the standard DataTransfer API
(clipboardData.items) for cross-browser compatibility.
On the download page, images are now displayed as previews in addition
to the download option.
Also fix Rust 2024 never-type-fallback compatibility by adding turbofish
type annotations to redis crate calls.
Swap redis:7-alpine images to valkey/valkey:7-alpine across all
docker-compose files and example READMEs. Keep service name as
"redis" so that the default REDIS=redis://redis/ connection string
still resolves correctly in Docker networking.
Also add turbofish type annotations to redis crate calls in store.rs
for Rust 2024 never-type-fallback compatibility, and fix a typo
("notion" -> "note") in an error message.
Stefan Meinecke