fix: address ObsidianReviewBot linting issues

- Add type guard for recursive parameter in notifications.ts to ensure
  only boolean values are stringified (prevents [object Object] output)
- Remove unused error variables from catch blocks across 5 files:
  - vault-tools.ts (5 instances)
  - frontmatter-utils.ts (3 instances)
  - search-utils.ts (2 instances)
  - waypoint-utils.ts (1 instance)

src/tools/vault-tools.ts

@@ -286,7 +286,7 @@ export class VaultTools {
 						try {
 							const content = await this.vault.read(item);
 							fileMetadata.wordCount = ContentUtils.countWords(content);
-						} catch (error) {
+						} catch {
 							// Skip word count if file can't be read (binary file, etc.)
 							// wordCount field simply omitted for this file
 						}
@@ -356,7 +356,7 @@ export class VaultTools {
 					frontmatterSummary: summary
 				};
 			}
-		} catch (error) {
+		} catch {
 			// If frontmatter extraction fails, just return base metadata
 		}
 
@@ -390,7 +390,7 @@ export class VaultTools {
 			if (folderWithStat.stat && typeof folderWithStat.stat.mtime === 'number') {
 				modified = folderWithStat.stat.mtime;
 			}
-		} catch (error) {
+		} catch {
 			// Silently fail - modified will remain 0
 		}
 		
@@ -442,7 +442,7 @@ export class VaultTools {
 				try {
 					const content = await this.vault.read(item);
 					metadata.wordCount = ContentUtils.countWords(content);
-				} catch (error) {
+				} catch {
 					// Skip word count if file can't be read (binary file, etc.)
 				}
 			}
@@ -712,7 +712,7 @@ export class VaultTools {
 							}
 						}
 					}
-				} catch (error) {
+				} catch {
 					// Skip files that can't be read
 				}
 			}

src/ui/notifications.ts

@@ -162,8 +162,8 @@ export class NotificationManager {
 			if (args.folder && typeof args.folder === 'string') {
 				keyParams.push(`folder: "${this.truncateString(args.folder, 30)}"`);
 			}
-			if (args.recursive !== undefined) {
-				keyParams.push(`recursive: ${String(args.recursive)}`);
+			if (typeof args.recursive === 'boolean') {
+				keyParams.push(`recursive: ${args.recursive}`);
 			}
 
 			// If no key params, show first 50 chars of JSON

src/utils/frontmatter-utils.ts

@@ -73,7 +73,7 @@ export class FrontmatterUtils {
 		let parsedFrontmatter: Record<string, YAMLValue> | null = null;
 		try {
 			parsedFrontmatter = parseYaml(frontmatter) || {};
-		} catch (error) {
+		} catch {
 			// If parsing fails, return null for parsed frontmatter
 			parsedFrontmatter = null;
 		}
@@ -326,7 +326,7 @@ export class FrontmatterUtils {
 							compressed: true // Indicate data is compressed
 						}
 					};
-				} catch (decompressError) {
+				} catch {
 					// Decompression failed
 					return {
 						isExcalidraw: true,
@@ -355,9 +355,9 @@ export class FrontmatterUtils {
 					version: jsonData.version || 2
 				}
 			};
-		} catch (error) {
+		} catch {
 			// If parsing fails, return with default values
-			const isExcalidraw = content.includes('excalidraw-plugin') || 
+			const isExcalidraw = content.includes('excalidraw-plugin') ||
 								 content.includes('"type":"excalidraw"');
 
 

src/utils/search-utils.ts

@@ -114,7 +114,7 @@ export class SearchUtils {
 					filesWithMatches.add(file.path);
 					matches.push(...filenameMatches);
 				}
-			} catch (error) {
+			} catch {
 				// Skip files that can't be read
 			}
 		}
@@ -323,7 +323,7 @@ export class SearchUtils {
 						waypointContent.push(line);
 					}
 				}
-			} catch (error) {
+			} catch {
 				// Skip files that can't be searched
 			}
 		}

src/utils/waypoint-utils.ts

@@ -100,7 +100,7 @@ export class WaypointUtils {
 		try {
 			const content = await vault.read(file);
 			hasWaypoint = this.hasWaypointMarker(content);
-		} catch (error) {
+		} catch {
 			// If we can't read the file, we can't check for waypoints
 		}