fix: container mount permissions, terminal shift, ESC capture

Bug 1 — in-container repo mounting:
- docker-compose.yml: added /data/working-copies:/data/working-copies mount
  to API container so workspace dirs are visible on host filesystem
- Dockerfile: create /data/working-copies dir in image

Bug 2 — /home/user not writable:
- workspace_manager.py: chmod 777 workspace dirs + 666 files after clone
  and after sync, so any container user can write
- manifest_compiler.py: explicit mkdir + chown + chmod 755 for home dir
  in generated Dockerfile

Bug 3 — terminal text shifts left on typing:
- terminal.tsx: removed manual term.refresh() after fit (caused reflow)
- Track lastSentCols/lastSentRows and only send resize when dimensions
  actually changed, preventing resize feedback loops

Bug 4 — ESC key captured by terminal:
- terminal.tsx: attachCustomKeyEventHandler allows ESC to propagate to
  browser when not in alternate buffer (vim/tmux), so modals/navigation
  work; ESC still sent to PTY when in vim/tmux alternate screen

Quality gates: ruff clean, tsc --noEmit clean, pytest workspaces (9 passed)

apps/api/src/services/manifest_compiler.py

@@ -26,7 +26,7 @@ def resolve_base(manifest: dict) -> dict:
     result = deepcopy(manifest)
 
     base_definition_id = result.pop("base_definition_id", None)
-    base_version = result.pop("base_version", "latest")
+    result.pop("base_version", None)
 
     if base_definition_id:
         # This will be provided by the caller (they have the DB session)
@@ -167,8 +167,11 @@ def compile_dockerfile(manifest: dict) -> str:
         lines.append(f"ENV HOME={home}")
         lines.append(f"ENV USER={name}")
         lines.append("")
+        # Ensure home directory exists and is writable by the user
+        lines.append(f"RUN mkdir -p {home} && chown {name}:{name} {home} && chmod 755 {home}")
+        lines.append("")
 
-    # Build scripts
+        # Build scripts
     build_scripts = manifest.get("scripts", {}).get("build", [])
     for script in build_scripts:
         # Normalize multi-line scripts into single RUN command