The web build could not reach any file: File > Open Session…, Import > Audio… and Import > MIDI…
showed a text box for a path the browser can't read, and every save or export failed with
«operation not supported on this platform», so work was lost on close.
On the web now:
- Open Session…, Import Audio… and Import MIDI… show the browser's file picker; files dropped on
the page open (sessions) or import (audio, MIDI) by extension. Files travel as bytes; imports are
one undo step each, like the import commands.
- A session is saved as ONE file, a bundle `<name>.scraftz`: a zip (stored entries) holding the
`.scraft` and its `Audio Files/` as 32-bit float WAV — the same layout as a session folder, since
the browser has no folders. `io::open_session_bytes` opens a bundle or a bare `.scraft` (its audio
is then reported missing). Bundles are hostile input: entry count and size are capped, and
declared sizes are never read past.
- Every single-file output (save, Save As Template, bounce, MIDI/score/text export, track presets)
goes through `io::write_file`: a file natively, a download in the browser via a delivery hook
(`io::set_deliver`) that only the web app installs.
- In the browser Save As asks for the bundle's name (`<name>.scraftz`) instead of a folder path.
Native builds keep writing files and session folders as before. Folder outputs (stems, clip
exports) are still not available on the web.
Pairs with #157 (Save on a never-saved session opens Save As), which the browser needs too: the
web app always starts on the unsaved demo.
New dependency: `zip` (MIT), default features off (stored entries only).
Checked: engine tests for the bundle round trip (every sample identical), same-named sources,
bare sessions and hostile bundles; `cargo xtask ci`. In Chromium on the packaged web build:
⌘⇧I picks and imports a WAV; WAV, MP3, FLAC, OGG, M4A, AIFF and MIDI import by drop; Save As →
`Midnight Groove.scraftz` downloads with the imported audio inside; that bundle reopens in a fresh
page with all tracks and no missing media, and saves again with the same content.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
