Add spec, plan, and tasks for 030-bulk-import-sources feature

Defines the "Bulk Import All Sources" feature for the on-demand bestiary
system: one-click loading of all ~104 bestiary sources with concurrent
fetching, progress feedback, toast notifications, and completion reporting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/030-bulk-import-sources/data-model.md

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+# Data Model: Bulk Import All Sources
+
+## Entities
+
+### BulkImportState
+
+Tracks the progress and outcome of a bulk import operation.
+
+| Field | Type | Description |
+|-------|------|-------------|
+| status | "idle" / "loading" / "complete" / "partial-failure" | Current phase of the import operation |
+| total | number | Total number of sources to fetch (excludes already-cached) |
+| completed | number | Number of sources successfully fetched and cached |
+| failed | number | Number of sources that failed to fetch |
+
+**State Transitions**:
+- `idle` → `loading`: User clicks "Load All"
+- `loading` → `complete`: All sources fetched successfully (failed === 0)
+- `loading` → `partial-failure`: Some sources failed (failed > 0)
+- `complete` / `partial-failure` → `idle`: User dismisses or starts a new import
+
+### ToastNotification
+
+Lightweight notification data for the toast component.
+
+| Field | Type | Description |
+|-------|------|-------------|
+| message | string | Primary text to display (e.g., "Loading sources... 34/102") |
+| progress | number (0-1) or undefined | Optional progress bar value |
+| dismissible | boolean | Whether the toast shows a dismiss button |
+| autoDismissMs | number or undefined | Auto-dismiss delay in ms; undefined means persistent |
+
+## Relationships
+
+- **BulkImportState** drives the content of both the side panel progress UI and the toast notification.
+- **ToastNotification** is derived from BulkImportState when the side panel is closed during an active import.
+- Both consume state from the `useBulkImport` hook.
+
+## Existing Entities (unchanged)
+
+- **CachedSourceRecord** (bestiary-cache.ts): Stores normalized creature data per source in IndexedDB. No schema changes.
+- **BestiaryIndex** (domain): Read-only index with source codes and compact creature entries. No changes.