Phase 3: JSON config import/export (profiles, vocab, prompts)

[initcore0]

First Phase 3 (hackability) item. Lets users back up, hand-edit, and share their setup — and lays the foundation that config packs will reuse.

Changes

• ConfigBundle (OpenWhispCore, Foundation-only, Codable): a versioned (schemaVersion) snapshot of profiles + vocabulary + named-command prompts.
  • Tolerant decode — every section optional, unknown keys ignored — so partial bundles / vocab-only packs round-trip and forward-compatible fields don't break an older importer.
  • Rejects a schemaVersion newer than the app understands; reports malformed input distinctly.
  • Pretty/sorted/stable JSON; a human-readable summary for import confirmation + pack listings.
• AppState: exportConfig() / applyConfig() / exportConfig(to:) / importConfig(from:). Import applies only the sections present (each @Published setter persists via its didSet), so a vocab-only file only changes vocabulary. History and secrets are excluded from export.
• SettingsView: a Backup & Sharing section (Advanced) with Export…/Import… (NSSavePanel/NSOpenPanel) and friendly status/error messages, including the file-needs-a-newer-app and malformed-file cases.
• Tests: +13 ConfigBundleTests (full/empty/partial round-trip, tolerant decode, unknown-key tolerance, version accept/reject, malformed, summary grammar). One caught a test bug (random Substitution ids per call) — fixed the test, not the product. 134 → 147.
• README + ROADMAP updated.

swift test 147/147 · ./build.sh clean.

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