MoreCast 2.0: Warning popup re: Ability to Save a Forecast

**As a** User Type/Persona
**I need** Feature/enhancement
**So That** Value, why is this needed, what does the user need to accomplish

Current State = users without the "forecaster" role can still edit values in the table
Feature Request = There should be a warning pop-up box that informs non-forecasters that their edits will not affect the official forecast nor FWI and HFI values.

**Acceptance Criteria**
- [ ] Given (Context), When (action carried out), Then (expected outcome)
- [ ] Given (Context), When (action carried out), Then (expected outcome)

**Additional Context**
- enter text here
- enter text here

**Definition of Done**
https://github.com/bcgov/wps/wiki/Definition-of-Done

The issue does not name a file or test; start by locating the MoreCast forecast table and the role-based save or edit handling. Reproduce an edit as a user without the forecaster role and identify the existing warning or notification path. Done means the requested warning is shown and clearly explains that edits do not affect the official forecast, FWI, or HFI values.

Written by the indexing model from the issue text.