[Add] self-service "Edit my profile" in the Session menu; fixes #722

[samatstariongroup]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following the COMET-WEB code style guidelines
• I have provided test coverage for my change (where applicable)

Description

Adds an Edit my profile entry to the Session dropdown that opens a tabbed popup populated from Session.ActivePerson:

• Basic — GivenName, Surname, OrganizationalUnit
• E-Mail / Telephone Number — list of existing entries with add/remove and default selection
• Password — opt-in checkbox; password + confirmation, save disabled until they match

Save goes through the existing ISessionService.CreateOrUpdateThingsWithNotification pipeline, so success/error toasts and the SDK write path are reused. Admin-only fields (PersonRole, Organization, IsActive, IsDeprecated) are deliberately not surfaced.

Implementation notes

• New PersonEditForm + PersonEditViewModel (and contact row VMs) live in COMET.Web.Common so the Session menu can reach them without inverting the project dependency into the admin UserManagementForm.
• ISessionMenuViewModel gains IsOnEditPersonMode, PersonEditViewModel, OpenEditPersonPopup(), with auto-close on save.
• The button + popup are added to both SessionMenu.razor (top-bar) and SessionSideBar.razor (sidebar — the variant the running app uses; inherits SessionMenu's code but not its markup).
• .session__buttons restyled into two stacked groups separated by a border-top so the profile action is visually grouped apart from Refresh / Log out.

Risks

• Self-locking on password change — a user changing their own password may need to re-auth on next request; surfaced via NotificationDescription.OnError. Auto-relogin is a follow-up.
• Removing existing emails/phones — relies on the COMET server treating absence-on-update as a delete, same as the admin form.

Test plan

• dotnet build COMETwebapp.sln --no-restore
• dotnet test --filter "FullyQualifiedName!~IntegrationTests" — 652 / 652 passing baseline
• Manual smoke against cdp4services-public.cdp4.org: open Edit my profile → edit name → Save → reopen and verify; add a second e-mail set as default → reopen and verify; change password (mismatch disables Save) → Save → success toast; Cancel performs no write.