feat: add a Report issue button to the header

[Ptitlouis6012]

Overrides Starlight's SocialIcons component to append a link to https://github.com/TigerTag-Project/TigerSystem-Docs/issues/new, styled with the same accent-high/black pairing as the hero's primary button so it reads as the one call-to-action color on the page.

[vercel]

@Ptitlouis6012 is attempting to deploy a commit to the Tiger-Project Team on Vercel.

A member of the Team first needs to authorize it.

[BenGlut]

Merged — thanks, this was clean and well scoped, and the accent-high/black reasoning was the right call: it reads as the page's single call-to-action colour.

Verified before merging by building it on top of main: the site builds, sync-docs --check and check-i18n pass, and both locales render their label. Worth knowing that the CI did not run on this PR — it came from a fork, and GitHub holds workflows for a first-time contributor until a maintainer approves them, so the only check shown was Vercel failing for the same reason. That is on us to sort out, not on you.

Three follow-ups landed in e214bb3, all small, none of them changing your design:

• Dropped rel="me". That attribute asserts the target is another profile of the same person — the IndieWeb/Mastodon verification convention. A new-issue form is not a profile.
• Hidden below Starlight's social-row breakpoint. I measured the link at 0×0 on a 375 px viewport: Starlight collapses that row, so the button was invisible to sighted users while still being announced to screen readers, and reachable by neither. display: none under 50rem takes it out of the accessibility tree too.
• The link now carries the page. It opens the issue form pre-filled with the path, in the reader's own language — so a report arrives already saying where the problem is instead of costing a round-trip to ask.

The third one is the reason the button will actually be useful rather than just present. Nice addition.