docs: document v7.13.0 features

- Live formulas (HARDFORMULA/SOFTFORMULA) with HyperFormula in dcc-validations
- Formula Rules section with column-name syntax, DC.* literals, editor behaviour
- MPE_VALIDATIONS table doc: add HARDFORMULA/SOFTFORMULA to RULE_TYPE values
- Roadmap: mark Frontend Formulae and Regex Rules as delivered
- SAS VA Embed: document Live vs Confirm filter modes and pending-changes UX
- ViewBoxes: document edge/corner drag resizing
- Licensing: combined-key paste, live key preview, protocol mismatch guard
- CAS Tables: REPLACE load type support and temp table cleanup
- Editor: native date/time pickers, paste-validation overlay, row status indicators
- Stage page: Formatted/Unformatted toggle on the approvals screen
- Viya deploy: configurator overhaul, deploy checks, login page UX
- Index page: add live formulas and VA embed to features list

docs/dc-userguide.md

@@ -48,6 +48,18 @@ After this, remaining columns are shown.  Dates / datetime fields have appropria
 
 New rows can be added using the right click context menu, or the 'Add Row' button.  The data can also be sorted by clicking on the column headers.
 
+#### Native Date and Time Pickers
+
+Date, time, and datetime columns use native browser pickers in the editor, providing a familiar, locale-aware editing experience.  Date columns use an `<input type="date">` picker, time columns use `<input type="time">` (24-hour), and datetime columns use `<input type="datetime-local">`.  The pickers are backed by Handsontable 17 Intl cell types for consistent formatting.
+
+#### Paste Validation Overlay
+
+When you paste data into the editor (or autofill cells by dragging), a validation overlay appears before the changes are applied.  This lets you review the pending changes and cancel or confirm them.  All pasted and autofilled cells are validated against the configured [validation rules](/dcc-validations/).  For large pastes, a progress banner shows the validation status.
+
+#### Row Status Indicators
+
+The row-header status cells are colour-coded to show whether each row is modified, added, deleted, or unchanged.  The "modified" symbol is `±` for clearer visual feedback.
+
 When ready to submit, hit the SUBMIT button and enter a reason for the change.  The owners of the data are now alerted (so long as their email addresses are in metadata) with a link to the approve screen.
 If you are also an approver you can approve this change yourself.
 
@@ -65,6 +77,8 @@ This page shows a list of the changes you have submitted (that are not yet appro
 ### Approvals
 This shows the list of changes that have been submitted to you (or your groups) for approval.
 
+When you open a submitted change for review, the staged data is displayed alongside the current values so you can see exactly what will change.  A **Formatted / Unformatted** toggle on the staging page lets you switch between viewing the data with SAS formats applied (eg `DATE9.` dates, `DOLLAR8.` currency) or as raw underlying values.  This is useful when you need to verify the actual value being submitted rather than its display representation.
+
 ### History
 View the list of changes to each table, who made the change, when, etc.