chore: fix linting errors - remove unused variables and escape apostrophe

Author: ulrikandersen

src/features/diff/data/OasDiffCalculator.ts

@@ -52,7 +52,6 @@ export class OasDiffCalculator implements IOasDiffCalculator {
 
         // Fetch spec content from both refs
         let spec1
-        let isNewFile = false
 
         try {
             spec1 = await this.githubClient.getRepositoryContent({
@@ -61,7 +60,7 @@ export class OasDiffCalculator implements IOasDiffCalculator {
                 path: path,
                 ref: fromRef
             })
-        } catch (error) {
+        } catch {
             // File doesn't exist in base ref - this is a new file
             return {
                 from: fromRef,

src/features/sidebar/view/internal/diffbar/DiffContent.tsx

@@ -66,7 +66,7 @@ const DiffContent = () => {
       {isNewFile && (
         <Box sx={{ textAlign: "left", py: 1, px: 1 }}>
           <Typography variant="body0" color="text.secondary">
-            This is a new file that doesn't exist on the base branch.
+            This is a new file that doesn&apos;t exist on the base branch.
           </Typography>
         </Box>
       )}