V2.3.0 — Ajout texte/image + barre outils verticale

- Ajout de texte libre sur les pages (Annotations > Ajouter du texte)
  - Texte multi-ligne, police, taille, couleur au choix
  - Position X/Y en mm, appliquer a page courante/toutes/paires/impaires
- Ajout d'image sur les pages (Annotations > Ajouter une image)
  - PNG/JPG/BMP/GIF/TIFF, position, taille, ratio auto
  - Memes options d'application
- Barre d'outils verticale a droite avec toutes les fonctions :
  - IMPOSITION : Livret, N-Up, Repetition, Manuel, Joindre
  - PAGES : Recadrer, Pg blanche, Fusionner
  - ANNOTATIONS : Texte, Image, Numeros, Masquer
  - REPERES : Coupe +/-, Bleed +/-
- Toolbar horizontale : Ouvrir, Enregistrer, Imprimer, Zoom

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/engine/add_content.py

@@ -0,0 +1,86 @@
+"""Moteur ajout de contenu (texte, image) sur les pages."""
+
+from pypdf import PdfReader, PdfWriter
+from reportlab.pdfgen import canvas
+from reportlab.lib.utils import ImageReader
+from .pdf_utils import get_page_size
+import io
+
+
+def add_text_to_pages(input_path, output_path, text, font_name="Helvetica",
+                       font_size=12, color=(0, 0, 0), x=0, y=0,
+                       apply_to="all", current_page=0):
+    """Ajouter du texte sur les pages."""
+    reader = PdfReader(input_path)
+    writer = PdfWriter()
+
+    for i, page in enumerate(reader.pages):
+        if _should_apply(i, apply_to, current_page):
+            w, h = get_page_size(page)
+            packet = io.BytesIO()
+            c = canvas.Canvas(packet, pagesize=(w, h))
+            c.setFont(font_name, font_size)
+            c.setFillColorRGB(*color)
+
+            # Multi-ligne
+            lines = text.split("\n")
+            line_height = font_size * 1.3
+            for j, line in enumerate(lines):
+                c.drawString(x, y - j * line_height, line)
+
+            c.showPage()
+            c.save()
+            packet.seek(0)
+            overlay = PdfReader(packet)
+            page.merge_page(overlay.pages[0])
+
+        writer.add_page(page)
+
+    with open(output_path, "wb") as f:
+        writer.write(f)
+    return output_path
+
+
+def add_image_to_pages(input_path, output_path, image_path, x=0, y=0,
+                        width=100, height=None, apply_to="all", current_page=0):
+    """Ajouter une image sur les pages."""
+    reader = PdfReader(input_path)
+    writer = PdfWriter()
+
+    img = ImageReader(image_path)
+    img_w, img_h = img.getSize()
+
+    if height is None or height <= 0:
+        height = width * (img_h / img_w)
+
+    for i, page in enumerate(reader.pages):
+        if _should_apply(i, apply_to, current_page):
+            w, h = get_page_size(page)
+            packet = io.BytesIO()
+            c = canvas.Canvas(packet, pagesize=(w, h))
+            c.drawImage(image_path, x, y, width=width, height=height,
+                        preserveAspectRatio=True, mask='auto')
+            c.showPage()
+            c.save()
+            packet.seek(0)
+            overlay = PdfReader(packet)
+            page.merge_page(overlay.pages[0])
+
+        writer.add_page(page)
+
+    with open(output_path, "wb") as f:
+        writer.write(f)
+    return output_path
+
+
+def _should_apply(page_index, apply_to, current_page):
+    page_num = page_index + 1
+    if apply_to == "all":
+        return True
+    elif apply_to == "current":
+        return page_index == current_page
+    elif apply_to == "even":
+        return page_num % 2 == 0
+    elif apply_to == "odd":
+        return page_num % 2 != 0
+    return False