fix: exclude title heading and wikilinks from word count

countWords() was including the title line (# Heading) in the count,
inflating it by ~2-3 words. Now strips the first H1 heading and
[[wikilinks]] before counting, so only body prose is tallied.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/Inspector.test.tsx

@@ -129,10 +129,10 @@ describe('Inspector', () => {
     expect(pill).toHaveStyle({ borderRadius: '16px' })
   })
 
-  it('computes word count from content minus frontmatter', () => {
+  it('computes word count from content minus frontmatter and title', () => {
     render(<Inspector {...defaultProps} entry={mockEntry} content={mockContent} />)
-    // "Test Project" (# stripped) + "This is a test note with some words to count." = 12 words
-    expect(screen.getByText('12')).toBeInTheDocument()
+    // Title "# Test Project" excluded; body: "This is a test note with some words to count." = 10 words
+    expect(screen.getByText('10')).toBeInTheDocument()
   })
 
   it('shows "Add property" button as disabled placeholder', () => {