Some header content breaks out of its box

This also fixes links inside of content that broke out of the header box being unclickable.

(cherry picked from commit e85d3f76514e6008bc974c7e07461428d20b5616)

Bug: 60787
Change-Id: I5579de3fdc4037b67d621bc06bb64bfb8dc382cf
Whitelist action=(un)watch

Used as a fallback for non-JS users, also unhides
the 'watch' tab/star

(cherry picked from commit a78de62ddaab52fd1db983c61494facb6c457cad)

Change-Id: Ie8bbd0a40421d7d279fb896ebaa15a7de8cbd38a