Add project overview import

docs/spec/08-current-product-backlog.md

@@ -5,18 +5,6 @@ requirements and intended sequencing, not proof of implementation.
 
 ## Circuit List Editor
 
-- Open the ProjectDevice drawer on the right so it does not cover the leading
-  circuit identifier and display-name columns.
-- Format displayed power values in kW with at most three decimal places.
-- Format displayed factors and percentage-like values with at most two decimal
-  places.
-- Do not round persisted values; formatting applies only to the displayed
-  value outside edit mode.
-- Replace the separate `Zeilensumme` and `Stromkreissumme` columns with one
-  `Gesamtsumme` column:
-  - device rows show their device-row total;
-  - circuit summary rows show the complete circuit total;
-  - compact single-device rows show the identical device/circuit total once.
 - Collect the remaining editor interaction issues before changing additional
   behavior.
 
@@ -53,20 +41,11 @@ requirements and intended sequencing, not proof of implementation.
   exceptional voltage is not silently overwritten when phase type or project
   settings change.
 
-## Project Overview Import
-
-- Add JSON project import to the project overview so a portable project file
-  can create a new project without first opening another project.
-- Keep replacement of an existing project inside that project's settings.
-- Validate format version and checksum before creating project data.
-
 ## Recommended Sequence
 
-1. Circuit-list presentation improvements.
-2. Project-overview import as a new project.
-3. Distribution-board floor and supply fields.
-4. Device voltage default and override semantics.
-5. Snapshot-to-revision descriptions and history presentation.
+1. Distribution-board floor and supply fields.
+2. Device voltage default and override semantics.
+3. Snapshot-to-revision descriptions and history presentation.
 
 The Revit/CSV/IFCGUID round-trip remains a separate jointly planned phase and
 must not be inferred from these tasks.