refactor: replace @ts-ignore with @ts-expect-error for stricter type suppression

Replace all 5 @ts-ignore comments with @ts-expect-error across the codebase.
@ts-expect-error will flag when suppressions become unnecessary, preventing
stale type suppressions from accumulating.

Nightshift-Task: lint-fix
Nightshift-Ref: https://github.com/marcus/nightshift

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Nick the Sick

packages/core/src/editor/BlockNoteEditor.ts

@@ -423,7 +423,7 @@ export class BlockNoteEditor<
       },
     };
 
-    // @ts-ignore
+    // @ts-expect-error - schema type mismatch due to conditional default
     this.schema = newOptions.schema;
     this.blockImplementations = newOptions.schema.blockSpecs;
     this.inlineContentImplementations = newOptions.schema.inlineContentSpecs;

packages/core/src/schema/inlineContent/types.ts

@@ -15,7 +15,7 @@ export type InlineContentConfig = CustomInlineContentConfig | "text" | "link";
 
 // InlineContentImplementation contains the "implementation" info about an InlineContent element
 // such as the functions / Nodes required to render and / or serialize it
-// @ts-ignore
+// @ts-expect-error - T extends union but conditional type only narrows custom configs
 export type InlineContentImplementation<T extends InlineContentConfig> =
   T extends "link" | "text"
     ? undefined

packages/xl-ai/src/api/formats/tests/sharedTestCases.ts

@@ -20,7 +20,7 @@ import { buildAIRequest } from "../../aiRequest/builder.js";
 
 const BASE_FILE_PATH = path.resolve(__dirname, "__snapshots__");
 
-// @ts-ignore
+// @ts-expect-error - unused helper kept for debugging snapshots
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 async function matchFileSnapshot(data: any, postFix = "") {
   const t = getCurrentTest()!;

packages/xl-ai/src/prosemirror/rebaseTool.ts

@@ -12,7 +12,7 @@ export function getApplySuggestionsTr(editor: BlockNoteEditor<any, any, any>) {
     applySuggestionsTr = tr;
   });
 
-  // @ts-ignore
+  // @ts-expect-error - applySuggestionsTr is assigned inside the callback above
   if (!applySuggestionsTr) {
     throw new Error("applySuggestionsTr is not set");
   }

packages/xl-odt-exporter/src/odt/odtExporter.test.ts

@@ -13,7 +13,7 @@ import { ColumnBlock, ColumnListBlock } from "@blocknote/xl-multi-column";
 import { partialBlocksToBlocksForTesting } from "@shared/formatConversionTestUtil.js";
 
 beforeAll(async () => {
-  // @ts-ignore
+  // @ts-expect-error - Blob polyfill for Node test environment
   globalThis.Blob = (await import("node:buffer")).Blob;
 });