Update: Send branded templated emails via the mailer (fixes #64)

[taylortom]

Fixes #64

Update

• sendInvite, forgotPasswordHandler, and the password-updated notification in updateUser now build a templated-email content object and send via the mailer's sendTemplated() (emblem + title + body + optional button) instead of assembling raw subject/text/html.
• createPasswordReset now takes (email, { subject, content }, lifespan), builds the reset URL into the content's button, and calls sendTemplated. Note: this is an internal signature change to createPasswordReset.
• Email copy now comes from the langpack email_invite_* / email_reset_* / email_passwordupdated_* keys (cgkineo/adapt-authoring-langpack-en#3); app name is read from adapt-authoring-core.
• Bumps the adapt-authoring-mailer peer dependency to ^1.6.0 (the version that adds sendTemplated).

Breaking

• createPasswordReset signature changed (see above) — flagging in case any external caller relies on the old (email, subject, text, html, lifespan) form.

Testing

• npm test — 163 pass (updated invite/reset/password-updated specs; new sendInvite content tests). npx standard clean.

Depends on

• New: Add branded templated email rendering (fixes #58) adapt-authoring-mailer#59 (sendTemplated)
• cgkineo/adapt-authoring-langpack-en#3 (copy keys)
• New: Add app-level branding config to core (fixes #118) adapt-authoring-core#119 (appName/branding config)

[github-actions]

🎉 This PR is included in version 2.6.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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