fix(tui): improve macOS paste and shortcut parity

- support Cmd-as-super and readline-style fallback shortcuts on macOS
- add layered clipboard/OSC52 paste handling and immediate image-path attach
- add IDE terminal setup helpers, terminal parity hints, and aligned docs

cli.py

@@ -26,6 +26,7 @@ import tempfile
 import time
 import uuid
 import textwrap
+from urllib.parse import unquote, urlparse
 from contextlib import contextmanager
 from pathlib import Path
 from datetime import datetime
@@ -1271,10 +1272,21 @@ def _resolve_attachment_path(raw_path: str) -> Path | None:
 
     if (token.startswith('"') and token.endswith('"')) or (token.startswith("'") and token.endswith("'")):
         token = token[1:-1].strip()
+    token = token.replace('\\ ', ' ')
     if not token:
         return None
 
-    expanded = os.path.expandvars(os.path.expanduser(token))
+    expanded = token
+    if token.startswith("file://"):
+        try:
+            parsed = urlparse(token)
+            if parsed.scheme == "file":
+                expanded = unquote(parsed.path or "")
+                if parsed.netloc and os.name == "nt":
+                    expanded = f"//{parsed.netloc}{expanded}"
+        except Exception:
+            expanded = token
+    expanded = os.path.expandvars(os.path.expanduser(expanded))
     if os.name != "nt":
         normalized = expanded.replace("\\", "/")
         if len(normalized) >= 3 and normalized[1] == ":" and normalized[2] == "/" and normalized[0].isalpha():
@@ -1361,6 +1373,7 @@ def _detect_file_drop(user_input: str) -> "dict | None":
         or stripped.startswith("~")
         or stripped.startswith("./")
         or stripped.startswith("../")
+        or stripped.startswith("file://")
         or (len(stripped) >= 3 and stripped[1] == ":" and stripped[2] in ("\\", "/") and stripped[0].isalpha())
         or stripped.startswith('"/')
         or stripped.startswith('"~')
@@ -1371,8 +1384,25 @@ def _detect_file_drop(user_input: str) -> "dict | None":
     if not starts_like_path:
         return None
 
+    direct_path = _resolve_attachment_path(stripped)
+    if direct_path is not None:
+        return {
+            "path": direct_path,
+            "is_image": direct_path.suffix.lower() in _IMAGE_EXTENSIONS,
+            "remainder": "",
+        }
+
     first_token, remainder = _split_path_input(stripped)
     drop_path = _resolve_attachment_path(first_token)
+    if drop_path is None and " " in stripped and stripped[0] not in {"'", '"'}:
+        space_positions = [idx for idx, ch in enumerate(stripped) if ch == " "]
+        for pos in reversed(space_positions):
+            candidate = stripped[:pos].rstrip()
+            resolved = _resolve_attachment_path(candidate)
+            if resolved is not None:
+                drop_path = resolved
+                remainder = stripped[pos + 1 :].strip()
+                break
     if drop_path is None:
         return None