Pin the dashboard with forgot-password outcomes and the People set-up banner - #470

Summary

Pins the dashboard that releases ship to CoderHelm/coderhelm@c599a92 (CoderHelm/coderhelm#311). It works with the gateway change in #464:

• The sign-in page's forgot password says what happened for the email, and names the sender to look for.
• Members and roles shows who hasn't signed in here yet, and has the set-up email banner and its "send to all" button.

Changes

• selfhost/versions.json: dashboardRef moves from b6fd1b5 to c599a92ad0c85b9354dbbe6dcf024761eb4f9534.

Verification

• bash scripts/bump-dashboard.sh c599a92ad0c85b9354dbbe6dcf024761eb4f9534 confirmed the commit is on CoderHelm/coderhelm main, and check-dashboard-ref.mjs passes.
• Forgot password says what happened and who sends it; People shows who hasn't signed in here coderhelm#311 CI is green: build, self-host build, and all four e2e shards.