fix(gui): Resolve discussion compression error and improve entry tinting visibility

- Implement missing format_discussion in project_manager.py.
- Fix malformed escape characters in compression AI prompt.
- Ensure discussion compression updates the entry list in-place for immediate GUI refresh.
- Refactor discussion entry tinting using channels to draw backgrounds reliably behind text.
- Standardize Files & Media inventory layout and management buttons.

src/gui_2.py

@@ -3114,15 +3114,20 @@ def render_discussion_hub(app: App) -> None:
 def render_discussion_entry(app: App, entry: dict, index: int) -> None:
  with imscope.id(f"disc_{index}"):
   role = entry.get("role", "User")
-  bg_col = vec4(20, 20, 20, 255) # default
-  if   role == "User": bg_col = vec4(30, 40, 55, 200)
-  elif role == "AI":   bg_col = vec4(35, 50, 40, 200)
-  elif role == "Vendor API": bg_col = vec4(45, 40, 30, 200)
+  # Subtle tints: User(Blue), AI(Green), Vendor(Orange), System(Dark)
+  bg_col = vec4(40, 50, 70, 0.25) if role == "User" else vec4(45, 60, 50, 0.25) if role == "AI" else vec4(60, 50, 40, 0.25) if role == "Vendor API" else vec4(30, 30, 30, 0.2)
   
-  with imscope.style_color(imgui.Col_.child_bg, bg_col):
-   collapsed, read_mode = entry.get("collapsed", False), entry.get("read_mode", False)
-   if imgui.button("+" if collapsed else "-"): entry["collapsed"] = not collapsed
-   imgui.same_line(); render_text_viewer(app, f"Entry #{index+1}", entry["content"], id_suffix=f"disc_btn_{index}"); imgui.same_line(); imgui.set_next_item_width(120)
+  draw_list = imgui.get_window_draw_list()
+  p_min = imgui.get_cursor_screen_pos()
+  full_width = imgui.get_content_region_avail().x
+  
+  draw_list.channels_split(2)
+  draw_list.channels_set_current(1) # Foreground
+  
+  imgui.begin_group()
+  collapsed, read_mode = entry.get("collapsed", False), entry.get("read_mode", False)
+  if imgui.button("+" if collapsed else "-"): entry["collapsed"] = not collapsed
+  imgui.same_line(); render_text_viewer(app, f"Entry #{index+1}", entry["content"], id_suffix=f"disc_btn_{index}"); imgui.same_line(); imgui.set_next_item_width(120)
   if imgui.begin_combo("##role", entry["role"]):
    for r in app.disc_roles:
     if imgui.selectable(r, r == entry["role"])[0]: entry["role"] = r
@@ -3160,6 +3165,7 @@ def render_discussion_entry(app: App, entry: dict, index: int) -> None:
    imgui.same_line(); 
    if imgui.button("Del"):
     if entry in app.disc_entries: app.disc_entries.remove(entry)
+    draw_list.channels_merge() # Must merge before return
     return
    imgui.same_line()
    if imgui.button("Branch"): app._branch_discussion(index)
@@ -3175,6 +3181,15 @@ def render_discussion_entry(app: App, entry: dict, index: int) -> None:
    if read_mode: render_discussion_entry_read_mode(app, entry, index)
    else:
     if not (bool(thinking_segments) and not has_content): ch, entry["content"] = imgui.input_text_multiline("##content", entry["content"], imgui.ImVec2(-1, 150))
+  imgui.end_group()
+  
+  draw_list.channels_set_current(0) # Background
+  p_max = imgui.get_item_rect_max()
+  p_max.x = p_min.x + full_width
+  draw_list.add_rect_filled(p_min, p_max, imgui.get_color_u32(bg_col), 4.0)
+  draw_list.channels_merge()
+  imgui.separator()
+  imgui.separator()
   imgui.separator()
 
 def render_discussion_entry_read_mode(app: App, entry: dict, index: int) -> None:

src/project_manager.py

@@ -49,6 +49,12 @@ def entry_to_str(entry: dict[str, Any]) -> str:
   return f"@{ts}\n{role}:\n{content}"
  return f"{role}:\n{content}"
 
+def format_discussion(entries: list[dict[str, Any]]) -> str:
+ """
+  Convert a list of discussion entry dicts into a single formatted string.
+ """
+ return "\n\n".join([entry_to_str(e) for e in entries])
+
 def str_to_entry(raw: str, roles: list[str]) -> dict[str, Any]:
  """