The import page without a source no longer shows a bare "no source found"
card. `ImportEmptyState` (built on the shared `EmptyState`) takes the place
of the empty `SourceList` in both situations: without an import folder it
offers "Choose a folder" as the single primary action; with a folder and no
bank sub-folder it offers "Create a sample folder" (primary, disabled while
in flight) and "Refresh" (secondary). Both variants, and the "?" help
popover through the new optional `linkTo` prop of `PageHelp`, link to the
bank CSV export guide at `/settings/users#import-export`. `SourceList`
stays an untouched pure list.
`useImportWizard` gains `createSampleFolders`: it invokes the Rust command
`create_sample_import_folders` with the folder and the webview's LOCAL date
(built from the local getters, not `toISOString()`), rescans the folder so
the two cards appear without another click, then raises a closable success
banner from the new `sampleCreated` state, which `reset` and a folder change
clear. A refusal from Rust (a sample folder already exists) lands in the
existing error banner. The log line carries the folder NAMES only, never
the absolute path, since the logs travel with a feedback report.
"Browse" on the folder card drops to the secondary style while no folder is
configured, so a single primary button is on screen. The reducer and its
initial state are exported as `wizardReducer` / `initialWizardState` and
unit-tested; `ImportEmptyState` is tested by direct call.
Resolves#356
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
