docs: document v7.13.0 features

- Live formulas (HARDFORMULA/SOFTFORMULA) in dcc-validations with operator-friendly explanations
- 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
- ViewBoxes: document edge/corner drag resizing
- Licensing: combined-key paste, key preview, protocol warning
- 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 improvements, deploy checks, login page UX
- Index page: add live formulas and VA embed to features list

docs/admin-services.md

@@ -22,4 +22,11 @@ Button info as follows:
 |Update Licence Key| Link to the screen for providing a new Data Controller licence key|
 |Export DC Library DDL|COMING SOON!!  <br>Exports the data controller control library in DB specific DDL (eg SAS, PGSQL, TSQL) and allows an optional schema name to be included|
 
+## Licence Key Screen
+
+The licence key screen is where you apply or update your Data Controller licence key.  Three improvements have been made to make this easier:
+
+* **Paste both keys at once** - if you have received a combined key, simply paste it into the licence key field and both the licence key and activation key fields are filled in automatically.  You can toggle between the combined-key input and the traditional two-field layout.
+* **Preview before applying** - as soon as both fields are populated, the key details (expiry date, number of users, active features) are displayed so you can confirm the key is correct before clicking Apply.
+* **Protocol warning** - if you paste a key that was generated for a different connection type than the one you are using (http vs https), a warning is shown and the Apply button is blocked, preventing a key that will not work from being saved.