fix(wikilinks): supporte les ancres internes [[#Titre|Texte]] et corrige les IDs de titres

- Ajoute la reconnaissance de la syntaxe Obsidian [[#Titre|Texte]] pour
  créer des liens d'ancre vers les titres du document courant.
- Corrige _heading_slugify pour ignorer les balises HTML et décoder les
  entités HTML (ex. &) avant de générer l'ID, évitant ainsi la
  pollution par les wikilinks placés dans les titres.
- Ajoute le style .wikilink-anchor et des tests couvrant ces cas.

Fixe le rendu du document TestDir/Agents IA - Panorama Complet 2026.md.

backend/main.py

@@ -824,17 +824,23 @@ def _heading_slugify(text: str) -> str:
 
     Matches the JavaScript slugify algorithm exactly using
     Unicode-aware character classification:
-    1. Lowercase
-    2. NFD normalize + strip combining marks
-    3. Keep only Unicode letters, numbers, spaces, hyphens
-    4. Replace spaces with hyphens, collapse multiple hyphens
+    1. Strip HTML tags (e.g. wikilink spans rendered inside headings)
+    2. Decode HTML entities (e.g. ``&`` → ``&``)
+    3. Lowercase
+    4. NFD normalize + strip combining marks
+    5. Keep only Unicode letters, numbers, spaces, hyphens
+    6. Replace spaces with hyphens, collapse multiple hyphens
 
     Args:
-        text: The heading text content.
+        text: The heading text content (may contain inline HTML).
 
     Returns:
         A URL-safe slug string.
     """
+    # Strip any inline HTML so it does not pollute the slug
+    text = re.sub(r"<[^>]+>", "", text)
+    # Decode HTML entities so &amp; becomes & before slugification
+    text = html_mod.unescape(text)
     text = text.lower()
     text = unicodedata.normalize("NFD", text)
     text = "".join(ch for ch in text if not unicodedata.combining(ch))
@@ -894,7 +900,12 @@ _markdown_renderer = mistune.create_markdown(
 def _convert_wikilinks(content: str, current_vault: str) -> str:
     """Convert ``[[wikilinks]]`` and ``[[target|display]]`` to clickable HTML.
 
-    Resolved links get a ``data-vault`` / ``data-path`` attribute pair.
+    Supports:
+    - Internal file links: ``[[My Note]]`` / ``[[My Note|display]]``
+    - Same-document anchors: ``[[#Heading]]`` / ``[[#Heading|display]]``
+
+    Resolved file links get a ``data-vault`` / ``data-path`` attribute pair.
+    Anchor links target the slugified heading ID in the current document.
     Unresolved links are rendered as ``<span class="wikilink-missing">``.
 
     Args:
@@ -907,6 +918,14 @@ def _convert_wikilinks(content: str, current_vault: str) -> str:
     def _replace(match):
         target = match.group(1).strip()
         display = match.group(2).strip() if match.group(2) else target
+
+        # Same-document anchor link: [[#Heading|display]]
+        if target.startswith("#"):
+            anchor_text = target[1:].strip()
+            anchor_slug = _heading_slugify(anchor_text)
+            link_display = display if display != target else anchor_text
+            return f'<a class="wikilink-anchor" href="#{anchor_slug}">{link_display}</a>'
+
         found = find_file_in_index(target, current_vault)
         if found:
             return (

frontend/style.css

@@ -2076,14 +2076,19 @@ select {
 }
 
 /* Wikilinks */
-.wikilink {
+.wikilink,
+.wikilink-anchor {
   color: var(--accent);
   border-bottom: 1px dashed var(--accent);
   cursor: pointer;
 }
-.wikilink:hover {
+.wikilink:hover,
+.wikilink-anchor:hover {
   opacity: 0.8;
 }
+.wikilink-anchor {
+  text-decoration: none;
+}
 .wikilink-missing {
   color: var(--text-muted);
   border-bottom: 1px dashed var(--text-muted);

tests/test_api_main.py

@@ -655,6 +655,26 @@ class TestConvertWikilinks:
         result = _convert_wikilinks("See ![[image.png]] here", "TestVault")
         assert "image" in result or "img" in result
 
+    def test_convert_wikilink_anchor(self):
+        from backend.main import _convert_wikilinks
+        result = _convert_wikilinks("[[#Section importante|voir section]]", "TestVault")
+        assert 'href="#section-importante"' in result
+        assert "wikilink-anchor" in result
+        assert "voir section" in result
+
+    def test_convert_wikilink_anchor_without_alias(self):
+        from backend.main import _convert_wikilinks
+        result = _convert_wikilinks("[[#Claude Code]]", "TestVault")
+        assert 'href="#claude-code"' in result
+        assert "Claude Code" in result
+
+
+class TestHeadingSlugifyHtmlStripping:
+    def test_slugify_strips_html_tags(self):
+        from backend.main import _heading_slugify
+        result = _heading_slugify('## 1. Agents installés localement <a href="#table-des-matieres">↩</a>')
+        assert result == "1-agents-installes-localement"
+
 
 # ═══════════════════════════════════════════════════════════════════
 # Secret Redactor