refactor(08-02): fix no-case-declarations and no-useless-escape (DIR-09)

- pathUtils.ts:47 — wrap case PathType.FILE_URL body in { ... } block scope
  (the let normalized declaration leaked across cases without braces)
- viewRenderers.ts:370 — drop unnecessary backslash inside regex character
  class: [-\/] -> [-/] (slash does not need escaping inside [...])

Nullish-coalescing audit: grep -rnE '\b(null|undefined|"")\s*\?\?' src/
returned only the documentation-comment hit at SettingsTab.ts:262. No
executable violations.

src/utils/pathUtils.ts

@@ -44,7 +44,7 @@ export function detectPathType(path: string): PathType {
 
 export function normalizeFilePath(path: string, type: PathType): string {
   switch (type) {
-    case PathType.FILE_URL:
+    case PathType.FILE_URL: {
       // Remove file:// or file:/// prefix and decode URI components
       // Windows often uses file:///C:/path, Unix uses file:///path
       let normalized = decodeURIComponent(path.replace(/^file:\/\/\/?/, ""));
@@ -54,7 +54,9 @@ export function normalizeFilePath(path: string, type: PathType): string {
         normalized = "/" + normalized;
       }
       return normalized;
-    
+    }
+
+
     case PathType.VAULT_RELATIVE:
       // Normalize path for Obsidian
       return normalizePath(path);

src/utils/viewRenderers.ts

@@ -367,7 +367,7 @@ export function parseMonthYear(input: string): Date | null {
   ];
 
   // Try YYYY-MM or YYYY/MM format
-  const numericMatch = input.match(/^(\d{4})[-\/](\d{1,2})$/);
+  const numericMatch = input.match(/^(\d{4})[-/](\d{1,2})$/);
   if (numericMatch) {
     const year = parseInt(numericMatch[1]);
     const month = parseInt(numericMatch[2]) - 1; // Month is 0-indexed