Notes: sync templates, fix Create layout, repair direct children, ListItems+ListNotes merge

=== Breaking ===
- CreateNote for unsupported parents (file/note/action/secret/worklog/link) -> error
- EnsureNotesFolder validates parent supports notes before creating Notes/

=== Templates (system_templates.json) ===
- folder.default: +notes module, +Notes folder in default_folders
- document.default: +notes module, +Notes folder, +Overview.md default file
- recipe.default: +Notes folder in default_folders
All container types now consistently declare notes support.

=== CreateNodeFromTemplate layout fix ===
- DefaultFolders created BEFORE DefaultFiles (so Notes/ exists)
- DefaultFile nodes now parented inside Notes folder, not the container
- File path, file record, notes record all canonical: Notes/Overview.md
- No root-level Overview.md created

=== ListItems (Files tab) ===
- bindings_files.go: ListItems now includes TypeNote (not just TypeFolder+TypeFile)
- Notes folder visible in Files tab tree
- Overview.md inside Notes shown with type='note', Mime='text/markdown'

=== ListNotes merge ===
- Collects from both Notes folder (canonical) and direct TypeNote children (compat)
- Duplicates excluded via seen set
- Canonical layout takes priority

=== RepairNotesLayout ===
- Moves direct TypeNote children into Notes folder via nodes.Move
- Updates files.path/files.filename for moved notes
- Skips non-container parents (file/note/etc)

=== Tests ===
- note_repair_test.go: 37 tests (24 old + 13 new)
  - SupportsNotes for containers/non-containers
  - EnsureNotesFolder rejects for unsupported parents
  - Create for file/note parent -> error, no state leak
  - Repair: skips non-containers, creates Notes folder, moves notes
  - Files tab: Notes folder visible, Overview content preserved after repair
- vault_layout_notes_files_test.go: 3 new ListItems/repair tests
  - ListItems shows Notes folder
  - ListItems inside Notes shows Overview with FileID
  - Repair moves direct children, ListItems reflects new layout
- Updated: suggest_test.go, trash_test.go, vault_layout_test.go expectations

=== Misc ===
- nodes/repository.go: ListByType helper for test use
- bindings_files.go: TypeNote in ListItems, Mime=text/markdown

internal/core/templates/system_templates.json

@@ -6,8 +6,8 @@
     "enabled": true,
     "system": true,
     "icon": "folder",
-    "default_modules": ["overview", "children", "activity"],
-    "default_folders": [],
+    "default_modules": ["overview", "notes", "children", "activity"],
+    "default_folders": ["Notes"],
     "default_files": [],
     "allowed_parent_types": ["folder", "project", "client", "root"],
     "allowed_child_templates": ["*"]
@@ -45,9 +45,9 @@
     "enabled": true,
     "system": true,
     "icon": "document",
-    "default_modules": ["overview", "files", "activity"],
-    "default_files": [],
-    "default_folders": [],
+    "default_modules": ["overview", "notes", "files", "activity"],
+    "default_files": [{"path": "Overview.md", "content_template": "document_overview"}],
+    "default_folders": ["Notes"],
     "allowed_parent_types": ["folder", "project", "client", "root"],
     "allowed_child_templates": ["*"]
   },
@@ -60,7 +60,7 @@
     "icon": "recipe",
     "default_modules": ["overview", "notes", "files", "activity"],
     "default_files": [{"path": "Overview.md", "content_template": "recipe_overview"}],
-    "default_folders": [],
+    "default_folders": ["Notes"],
     "allowed_parent_types": ["folder", "root"],
     "allowed_child_templates": ["*"]
   }