Fix ox-hugo export with internal ID links and Quartz config

- Add org-id resolution for [[id:...]] links by building ID locations
  database once before parallel export
- Handle broken file links gracefully with org-export-with-broken-links
- Fix race condition in parallel exports by pre-building ID cache
- Fix Quartz config not being applied: cp was preserving nix store hash
  prefix in filename instead of using explicit destination filename
- Continue pipeline even when some exports fail, reporting failures
- Improve error handling and logging throughout export pipeline

lib/org_garden/server.ex

@@ -87,18 +87,14 @@ defmodule OrgGarden.Server do
     }
 
     # Run initial pipeline synchronously
-    case run_initial_pipeline(state) do
-      :ok ->
-        # Start supervised components
-        case start_supervisor(state) do
-          {:ok, sup_pid} ->
-            Logger.info("Server started on http://localhost:#{http_port}")
-            Logger.info("Watching #{notes_dir} for changes")
-            {:ok, %{state | supervisor_pid: sup_pid}}
+    :ok = run_initial_pipeline(state)
 
-          {:error, reason} ->
-            {:stop, reason}
-        end
+    # Start supervised components
+    case start_supervisor(state) do
+      {:ok, sup_pid} ->
+        Logger.info("Server started on http://localhost:#{http_port}")
+        Logger.info("Watching #{notes_dir} for changes")
+        {:ok, %{state | supervisor_pid: sup_pid}}
 
       {:error, reason} ->
         {:stop, reason}
@@ -148,13 +144,13 @@ defmodule OrgGarden.Server do
 
     # Export all org files
     case OrgGarden.Export.export_all(notes_dir, output_dir) do
-      {:ok, 0} ->
+      {:ok, 0, []} ->
         Logger.warning("No .org files found in #{notes_dir}")
         # Still generate index (will be empty or have default content)
         OrgGarden.Index.generate(content_dir)
         :ok
 
-      {:ok, count} ->
+      {:ok, count, []} ->
         Logger.info("Exported #{count} file(s)")
 
         # Run transforms
@@ -168,9 +164,23 @@ defmodule OrgGarden.Server do
         OrgGarden.Index.generate(content_dir)
         :ok
 
-      {:error, failures} ->
-        Logger.error("Failed to export #{length(failures)} file(s)")
-        {:error, {:export_failed, failures}}
+      {:ok, count, failures} ->
+        Logger.warning("Exported #{count} file(s), #{length(failures)} failed")
+
+        Enum.each(failures, fn {f, {:error, {:emacs_exit, code}}} ->
+          Logger.warning("  failed: #{Path.basename(f)} (emacs exit code #{code})")
+        end)
+
+        # Continue with transforms and index anyway
+        {:ok, stats} = OrgGarden.run(content_dir, @transforms, pipeline_opts)
+
+        Enum.each(stats, fn {mod, c} ->
+          Logger.info("#{inspect(mod)}: #{c} file(s) modified")
+        end)
+
+        # Generate index
+        OrgGarden.Index.generate(content_dir)
+        :ok
     end
   end