feat(journals): implement centralized export templates and bulk interop

- Added 'ae_journals_export_templates.ts' with Markdown, HTML, and JSON support
- Refactored 'ae_comp__modal_journal_export.svelte' to use the new template system
- Optimized bulk export with automated template selection based on Journal type
- Integrated 'Import Entries' action directly into the Journal menu
- Updated project documentation to reflect portability features and implementation status

src/routes/journals/[journal_id]/entry/[journal_entry_id]/+page.svelte

@@ -325,6 +325,7 @@
     <AeCompModalJournalExport
         bind:open={show_export_modal}
         entries={$lq__journal_entry_obj ? [$lq__journal_entry_obj] : []}
+        journal={$lq__journal_obj}
         onClose={() => show_export_modal = false}
     />
 {:else}