docs(search): finish the fold fixtures by rewriting both halves of the pair

The last two occurrences lived in the Unicode fold corpus, which an earlier
attempt left alone after a textual substitution failed the spec. The reason it
failed is the point: one row is a precomposed/decomposed PAIR — U+0401 against
U+0415 U+0308 — asserting that both spellings fold to one string. Replacing
the visible text rewrites only the composed half and silently turns the pair
into two different words, which is not a thing a reader or a regex can see.

Rewrite both halves by code point instead, keeping the decomposed half
decomposed: U+0415 U+0308 + the new stem. Verified by decoding every quoted
string in the file afterwards, and the spec passes (534/534).

A repository-wide sweep now finds no occurrence of the replaced titles in
either normalization form.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

libs/shared/interfaces/src/lib/search-text-fold.util.spec.ts

@@ -13,7 +13,7 @@ describe('foldSearchText', () => {
         ['Ünlü Şef', 'ünlü şef'],
         ['ÇANAKKALE', 'çanakkale'],
         ['Первый канал HD', 'первый канал hd'],
-        ['Ёлки', 'ёлки'],
+        ['Ёжик', 'ёжик'],
         ['Йога для всех', 'йога для всех'],
         ['Ελλάδα Σήμερα', 'ελλάδα σήμερα'],
         ['Amélie', 'amélie'],
@@ -28,7 +28,7 @@ describe('foldSearchText', () => {
     it.each([
         ['Amélie', 'Amélie'],
         ['İnşaat', 'İnşaat'],
-        ['Ёлки', 'Ёлки'],
+        ['Ёжик', 'Ёжик'],
         ['Йога', 'Йога'],
         ['Ünlü', 'Ünlü'],
         ['Ά', 'Ά'],