Fix nav overlapping settings on specific screen sizes

https://imgur.com/a/39hLlbx

CSS grid could possibly avoid the complexity here but I am not
refactoring in this change.

Debugging and fix suggested by brohlfs@. His explanation is very nice
so I have reformatted and re-linked it below:

```
The screen width threshold for the div.main to become smaller is 67em =
67·16px = 1072px (note that em in media queries translates to 16px, the
browser font default):
https://cs.opensource.google/gerrit/gerrit/gerrit/+/master:polygerrit-ui/app/styles/gr-menu-page-styles.ts;l=35;drc=94fcbbc0a6ba92cd736fcc5307c045d6d3339eb3

Until that happens div.main has a width of 50em = 50·14px = 700px and
an auto margin (note that em here translates to 14px, the font size of
the parent element).
https://cs.opensource.google/gerrit/gerrit/gerrit/+/master:polygerrit-ui/app/styles/gr-menu-page-styles.ts;l=12;drc=94fcbbc0a6ba92cd736fcc5307c045d6d3339eb3

So on the left there is only a margin of (1072px - 700px - 16px) / 2 =
178px.

The absolutely positioned <nav> has a fixed width of 14em = 14·14px =
196px until it disappears at screen width 53em = 53·16px = 848px:
https://cs.opensource.google/gerrit/gerrit/gerrit/+/master:polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.ts;l=52;drc=42c1a45f81a8c45966b47622fd2dad2f37fc1439
https://cs.opensource.google/gerrit/gerrit/gerrit/+/master:polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.ts;l=57;drc=42c1a45f81a8c45966b47622fd2dad2f37fc1439

Since 196px is larger than 178px we have an overlap.

Maybe we should just change 67em here to 70em:
https://cs.opensource.google/gerrit/gerrit/gerrit/+/master:polygerrit-ui/app/styles/gr-menu-page-styles.ts;l=12;drc=94fcbbc0a6ba92cd736fcc5307c045d6d3339eb3
```

Release-Notes: skip
Google-Bug-Id: b/264603277
Change-Id: Ifc63d7f68b87106c1ba6f55e47a20b2e9692c9b8
1 file changed
tree: cdeda304f4a1e84226091bc95a6c8ad21be83218
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. web-dev-server.config.mjs
  40. WORKSPACE
  41. yarn.lock
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