feat: confirm before signing out #minor

[pingsutw]

TL;DR

Sign Out in the avatar menu goes straight to Admin's /logout on click. This puts a confirmation dialog in front of it, styled like the existing "Authorization Required" panel.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested — covered by unit tests; not exercised against a live Admin
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

UserProfile's Sign Out was a <Button href={getLogoutUrl()}> inside a popover — a stray click on a small menu item ends the session, and the only way back is logging in again.

• SessionDialog — the styled Dialog extracted out of LoginPanel (centered logo, 448px paper, full-width stacked actions). No visual change to the login panel; it just imports the shell now, so the two session modals stay in step.
• SignOutPanel — logo, "Sign out of Flyte?", Sign Out (still just an anchor to getLogoutUrl(), so the logout flow itself is untouched) and Cancel. Strings go through createLocalizedString, matching the rest of the nav bar.
• UserProfile — the menu item now opens the dialog. It renders outside the Popover so closing the menu doesn't unmount it.

Unit tests cover the closed state, the confirm link target, and Cancel firing onCancel:

$ cd packages/primitives && NODE_ENV=test npx jest src/SessionManagent
PASS src/SessionManagent/signOutPanel.test.tsx
  ✓ renders nothing while closed
  ✓ confirms to the logout url and cancels without leaving

Tracking Issue

NA

Follow-up issue

NA

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.71%. Comparing base (17ef806) to head (6db8808).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...ckages/primitives/src/CustomNavBar/UserProfile.tsx	16.66%	5 Missing ⚠️
packages/primitives/src/SessionManagent/index.ts	0.00%	2 Missing ⚠️
...ages/primitives/src/SessionManagent/LoginPanel.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #937      +/-   ##
==========================================
+ Coverage   54.62%   54.71%   +0.09%     
==========================================
  Files         585      588       +3     
  Lines       15316    15413      +97     
  Branches     2801     2831      +30     
==========================================
+ Hits         8366     8433      +67     
- Misses       6950     6980      +30     

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