The free-form key=value run-flow dialog produced two
unhelpful failures every time an operator hit Run:
1. Submit empty → "step references missing value
'\$inputs.document'" from the hub. Studio sent a zero-
entry inputs map because nothing told the operator the
flow declared a required input.
2. Type `document=@/path/to/file` → "path not found".
Dart's `File()` doesn't expand `~`, and on macOS
sandboxed Studio can't read arbitrary paths anyway.
Both failure modes are gone. The dialog is now a typed form:
- On open, fetches `getFlowDefinition(name)` (new SDK
v0.15.0 wrapper around the v0.10.89 hub RPC). While that
resolves, a small spinner shows
"Loading inputs…"; on failure, an inline `FaiErrorBox`
with the exact RPC error and a copy button replaces the
spinner.
- Renders one form-field per declared input. The flow
YAML's verbatim type tag drives the widget choice:
`bytes` / `file` → "Choose file…" button + picked-file
readout, plain TextField for everything else. The type
tag is shown next to the input name as a pill so a flow
author who picks a less-common type still gets a hint.
- Bytes inputs route through `file_picker` with
`withData: true`, which means the OS file dialog handles
read access — sandboxed Studio gets the bytes inline
rather than a path it can't open. Falls back to
`File(path).readAsBytes()` on Linux configs that don't
honour `withData` for large files; failures show a
copyable SnackBar.
- The Run button enables only when every declared input has
a value (text non-empty / file picked). Empty submission
is impossible; the cryptic hub-side
"missing value" error stops surfacing.
- The run-result dialog's error path uses `FaiErrorBox`
instead of the previous plain `SelectableText`, so any
hub-side flow error (permission denied, module crash,
whatever) is one click to clipboard.
11 new ARB keys cover the form's labels, the file-picker
states, the loading / failed-definition messages, the
"This flow declares no inputs" empty state, and the
run-error dialog title.
`file_picker: ^8.0.0` added to pubspec.yaml.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
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