/**
 * Retrieves a concept by ID with support for both local (virtual) and server concepts.
 *
 * This is the primary function for fetching concepts in offline/local mode. It intelligently
 * handles three types of concept IDs and retrieves from appropriate sources:
 *
 * **ID Types Handled:**
 * 1. **Negative IDs (Virtual/Local)**: Concepts created locally not yet synced
 *    - Stored in LocalConceptsData (IndexedDB)
 *    - Return negative IDs
 *
 * 2. **Synced Virtual IDs**: Originally local concepts now synced to backend
 *    - Looked up via LocalGhostIdTree (maps negative to positive IDs)
 *    - Returns positive (real) ID with ghostId reference
 *
 * 3. **Positive IDs (Server)**: Real backend concepts
 *    - Fetched via GetTheConcept from backend
 *    - Converted to LConcept format
 *    - May have undefined ghostId
 *
 * **Retrieval Strategy:**
 * - If id < 0: Check LocalConceptsData → Check LocalGhostIdTree
 * - If id >= 0: Fetch from backend → Convert to LConcept
 * - Routes through service worker if enabled
 * - Returns default empty concept if not found
 *
 * **Ghost ID System:**
 * - ghostId: Original negative ID (preserved after sync)
 * - id: Current ID (negative if local, positive if synced)
 * - LocalGhostIdTree maintains the mapping
 *
 * @param id - The concept ID to retrieve. Can be:
 *            - Negative (e.g., -12345) for local-only concepts
 *            - Positive (e.g., 789) for server concepts
 *
 * @returns Promise resolving to a Concept object in LConcept format.
 *         Returns default concept (id=0) if not found.
 *
 * @example
 * // Get a local concept (negative ID)
 * const localConcept = await GetTheConceptLocal(-12345);
 * console.log(localConcept.id); // -12345
 * console.log(localConcept.characterValue); // "Draft Note"
 *
 * @example
 * // Get a synced concept (originally local, now on server)
 * const syncedConcept = await GetTheConceptLocal(-12345);
 * console.log(syncedConcept.id); // 789 (now positive, synced)
 * console.log(syncedConcept.ghostId); // -12345 (original ID preserved)
 *
 * @example
 * // Get a server concept
 * const serverConcept = await GetTheConceptLocal(456);
 * console.log(serverConcept.id); // 456
 * // Converted to LConcept format for consistency
 *
 * @throws Logs errors but returns default concept instead of throwing
 *
 * @see {@link CreateTheConceptLocal} for creating local concepts
 * @see {@link GetTheConcept} for fetching server concepts only
 * @see {@link convertFromConceptToLConcept} for format conversion
 */
export declare function GetTheConceptLocal(id: number): Promise<any>;