Fix: right-aligned dropdown menus overflow off the right edge of the page

[stevewallone]

Description

Fixes #15125.

When bootstrap.min.css was dropped, the essential Bootstrap dropdown rules
were re-implemented by hand in components/tailwind.css (the block commented
"Bootstrap dropdown compat — since bootstrap.min.css is not loaded…"). That
compat block recreated .dropdown-menu but omitted the .dropdown-menu-right
utility (right: 0; left: auto).

As a result, every menu marked class="dropdown-menu dropdown-menu-right" lost
its right-alignment and fell back to left-alignment (left: 0), opening to the
right of its toggle. Where the toggle sits flush against the right edge of the
page — most visibly the finding actions menu on the View Finding page — the
menu overflows off the right edge, clipping its labels ("Edit Fin…", "Copy
Fin…") and forcing the whole page into horizontal scroll.

This affects 42 usages across 30+ templates (findings, products,
engagements, tests, endpoints, users, metrics, …), not just the finding page.

The fix restores the single missing utility in the Bootstrap-compat block and
rebuilds tailwind-out.css:

.dropdown-menu-right { right: 0; left: auto; }

The sibling .dropdown-menu-left variant has 0 usages in the templates, so
it is intentionally not added (keeping the change minimal).

Test results

No Python was touched, so there is no unit test to add — this is a pure
CSS/build change and DefectDojo has no CSS test harness. Verified manually in
the running app (docker-compose), before and after, on /finding/<id>:

• Before: menu right edge at x=1645 vs viewport 1435 → overflows; page
  scrollWidth 1645 (horizontal scroll present); labels clipped.
• After: menu right-aligns to the toggle, right edge x=1552 vs viewport
  1589 → fully on-page; scrollWidth == viewport (no horizontal scroll); all
  labels readable.

The rebuilt tailwind-out.css diff is exactly one inserted rule
(.dropdown-menu-right{left:auto;right:0}) — built with tailwindcss 4.2.4 to
match the version that produced the committed artifact, so no unrelated churn.
makemigrations --check is not applicable (no model changes).

Documentation

None — internal CSS regression, no user-facing docs reference this.

Checklist

• Bugfix submitted against the bugfix branch.
• Meaningful PR name for release notes.
• Ruff compliant (no Python changed).
• Python 3.13 compliant (no Python changed).
• No model changes / migrations.
• Unit tests — N/A (CSS-only; verified manually with before/after evidence).
• Categorised as a bugfix — please add the bugfix label (fork PRs can't set labels).