revert: rollback _render_file_viewer wiring and URL encoding

Rollback des commits 2226e5e et 2534e2b — les fichiers continuent
de s'ouvrir dans page_editor.html (layout normal avec sidebar),
pas dans le viewer standalone _render_file_viewer.

app/routers/board.py

@@ -926,10 +926,6 @@ async def view_page(request: Request, page_id: int):
             return HTMLResponse("<h2>Page not found</h2>", status_code=404)
     page = dict(row)
 
-    # For file-type pages (PDFs, images, etc.), use the dedicated file viewer
-    if page.get("content_format") == "file":
-        return _render_file_viewer(page, request)
-
     ws = page.get("workspace", "")
     parts = ws.split("/") if "/" in ws else ["", ""]
     owner, repo = parts[0], parts[1] if len(parts) > 1 else ""
@@ -963,8 +959,7 @@ async def view_page(request: Request, page_id: int):
                 ws_id = p.replace("workspace_", "")
                 break
         filename = fp_parts[-1] if fp_parts else page.get("title", "File")
-        from urllib.parse import quote
-        file_url = f"/api/files/{ws_id}/{quote(filename, safe='')}" if ws_id else ""
+        file_url = f"/api/files/{ws_id}/{filename}" if ws_id else ""
         page_data["file_url"] = file_url
         page_data["file_mime"] = mime_type
         page_data["file_size"] = file_size
@@ -1011,8 +1006,7 @@ def _render_file_viewer(page: dict, request: Request) -> HTMLResponse:
             break
     filename = parts[-1] if parts else title
 
-    from urllib.parse import quote
-    file_url = f"/api/files/{ws_id}/{quote(filename, safe='')}" if ws_id else ""
+    file_url = f"/api/files/{ws_id}/{filename}" if ws_id else ""
 
     # Determine viewer type
     is_image = mime_type.startswith("image/")

app/routers/dashboard.py

@@ -235,11 +235,6 @@ async def view_page_root(request: Request, page_id: int):
             return HTMLResponse("<h2>Page not found</h2>", status_code=404)
     page = dict(row)
 
-    # For file-type pages (PDFs, images, etc.), use the dedicated file viewer
-    if page.get("content_format") == "file":
-        from app.routers.board import _render_file_viewer
-        return _render_file_viewer(page, request)
-
     ws = page.get("workspace", "")
     parts = ws.split("/") if "/" in ws else ["", ""]
     owner, repo = parts[0], parts[1] if len(parts) > 1 else ""
@@ -275,8 +270,7 @@ async def view_page_root(request: Request, page_id: int):
                 ws_id = p.replace("workspace_", "")
                 break
         filename = fp_parts[-1] if fp_parts else page.get("title", "File")
-        from urllib.parse import quote
-        file_url = f"/api/files/{ws_id}/{quote(filename, safe='')}" if ws_id else ""
+        file_url = f"/api/files/{ws_id}/{filename}" if ws_id else ""
         page_data["file_url"] = file_url
         page_data["file_mime"] = mime_type
         page_data["file_size"] = file_size