Add offline ui state to glic fre dialog

Screenshots:
dark mode - https://screenshot.googleplex.com/7Nu2Xka8LEU3otu.png
light mode - https://screenshot.googleplex.com/6fyJVhf2Vm39LTP.png

Bug: 393162528
Change-Id: Ib90ee5ec564e17929feb536da3b61a31c004d5c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6289916
Reviewed-by: Sana Akbani <sanaakbani@google.com>
Reviewed-by: Andrea Gomez <andreaxg@google.com>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Commit-Queue: Anthony Cui <cuianthony@chromium.org>
Reviewed-by: Dan Harrington <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1437256}