feat(gui): Implement on-demand definition lookup with clickable navigation and collapsing

src/gui_2.py

@@ -21,6 +21,8 @@ from src import log_registry
 from src import log_pruner
 from src import models
 from src import app_controller
+from src import mcp_client
+import re
 
 from pydantic import BaseModel
 from imgui_bundle import imgui, hello_imgui, immapp, imgui_node_editor as ed
@@ -1404,7 +1406,33 @@ class App:
       if read_mode:
        imgui.begin_child("read_content", imgui.ImVec2(0, 150), True)
        if self.ui_word_wrap: imgui.push_text_wrap_pos(imgui.get_content_region_avail().x)
-       imgui.text(entry["content"])
+       content = entry["content"]
+       last_idx = 0
+       pattern = re.compile(r"\[Definition: (.*?) from (.*?) \(line (\d+)\)\](\s+```[\s\S]*?```)?")
+       for match in pattern.finditer(content):
+        before = content[last_idx:match.start()]
+        if before: imgui.text(before)
+        header_text = match.group(0).split("\n")[0].strip()
+        path = match.group(2)
+        code_block = match.group(4)
+        if imgui.collapsing_header(header_text):
+         if imgui.button(f"[Source]##{i}_{match.start()}"):
+          res = mcp_client.read_file(path)
+          if res:
+           self.text_viewer_title = path
+           self.text_viewer_content = res
+           self.show_text_viewer = True
+         if code_block:
+          code_content = code_block.strip()
+          if code_content.count("\n") + 1 > 50:
+           imgui.begin_child(f"code_{i}_{match.start()}", imgui.ImVec2(0, 200), True)
+           imgui.text(code_content)
+           imgui.end_child()
+          else:
+           imgui.text(code_content)
+        last_idx = match.end()
+       after = content[last_idx:]
+       if after: imgui.text(after)
        if self.ui_word_wrap: imgui.pop_text_wrap_pos()
        imgui.end_child()
       else: