fix: handle square bracket HTML entities in Gemini responses

- Added support for [, ], [, and ] entities
- Fixes issue where Gemini API responses were missing square brackets in C# array syntax
- Added comprehensive tests for square bracket entity handling

Fixes #7576

Author: roomote

src/utils/__tests__/text-normalization.spec.ts

@@ -75,5 +75,30 @@ describe("Text normalization utilities", () => {
 			expect(unescapeHtmlEntities("")).toBe("")
 			expect(unescapeHtmlEntities(undefined as unknown as string)).toBe(undefined)
 		})
+
+		it("unescapes square bracket entities (numeric)", () => {
+			expect(unescapeHtmlEntities("string[]")).toBe("string[]")
+			expect(unescapeHtmlEntities("array[0]")).toBe("array[0]")
+			expect(unescapeHtmlEntities("matrix[i][j]")).toBe("matrix[i][j]")
+		})
+
+		it("unescapes square bracket entities (named)", () => {
+			expect(unescapeHtmlEntities("string[]")).toBe("string[]")
+			expect(unescapeHtmlEntities("array[0]")).toBe("array[0]")
+			expect(unescapeHtmlEntities("matrix[i][j]")).toBe("matrix[i][j]")
+		})
+
+		it("handles C# array syntax with escaped square brackets", () => {
+			// Test case based on the reported issue
+			const input = "string[] myArray = new string[5];\nmyArray[2] = "hello";"
+			const expected = 'string[] myArray = new string[5];\nmyArray[2] = "hello";'
+			expect(unescapeHtmlEntities(input)).toBe(expected)
+		})
+
+		it("handles mixed square bracket entities", () => {
+			const input = "array[0] and [1]"
+			const expected = "array[0] and [1]"
+			expect(unescapeHtmlEntities(input)).toBe(expected)
+		})
 	})
 })

src/utils/text-normalization.ts

@@ -91,5 +91,9 @@ export function unescapeHtmlEntities(text: string): string {
 		.replace(/"/g, '"')
 		.replace(/'/g, "'")
 		.replace(/'/g, "'")
+		.replace(/[/g, "[")
+		.replace(/]/g, "]")
+		.replace(/[/g, "[")
+		.replace(/]/g, "]")
 		.replace(/&/g, "&")
 }