fix(ui): resolve 15+ broken CTA links across the site

Summary

At least 15 CTAs across the site point to non-functional hash anchors (#). Every broken link is a lost conversion — particularly donation, job submission, newsletter subscribe, and conference registration.

Requirements

• FinancialStatusPage: #donate → link to actual donation page or Community Initiatives giving form
• SubmitJobPage: #submit-form → embed Google Form or link to it
• CalendarPage: #subscribe → Google Calendar subscribe URL
• ConferencePage: #cfp → actual call for proposals URL
• ConferencePage: #review → reviewer signup Google Form
• ConferencePage: #sponsor → sponsorship info or contact
• ConferencePage: #mailing-list → mailing list signup
• NewslettersPage: all "Read this issue" links → actual newsletter URLs (us-rse.org/newsletters/...)
• NewsUpdatesPage: all "Read" links → actual article URLs
• LeadershipMessagesPage: all "Read" links → actual message URLs
• DEIPage: /#wg → /community/working-groups (router link)
• SponsorsPage: "Make a Contribution" → donation link (not /#join)
• WorkingGroupsPage: 9 hash links → inline expandable details or actual WG pages

Context

Identified in the site visual audit (docs/strategy/2026-04-29-site-visual-audit.md). These dead ends affect all 4 user personas — new visitors, potential members, active members, and employers/sponsors.

Start with docs/strategy/2026-04-29-site-visual-audit.md, then locate FinancialStatusPage, SubmitJobPage, CalendarPage, ConferencePage, NewslettersPage, NewsUpdatesPage, LeadershipMessagesPage, DEIPage, SponsorsPage, and WorkingGroupsPage. Search these entry points for the listed hash links and read links; done means each CTA resolves to its intended donation, form, calendar, article, message, or working-group destination without dead anchors.