webgui: navbar alignment fix for cicada theme

[Greelan]

Important notices

Before you submit a pull request, we ask you kindly to acknowledge the following:

• I have read the contributing guidelines at https://github.com/opnsense/plugins/blob/master/CONTRIBUTING.md
• I opened an issue first for non-trivial changes and linked it below.
• AI tools were used to create at least part of the code submitted herewith.

If AI was used, please disclose:

• Model used: Clause Opus 4.6
• Extent of AI involvement: Assisted with reviewing the differences between the cicada theme and the other themes (opnsense, opnsense-dark and rebellion), to pinpoint the source of the issue

---

Describe the problem

The cicada theme's placement of the "hamburger" menu item and the OPNsense logo is misaligned on mobile, with the hamburger icon pushed too low, so that part of the first menu item (Lobby) is obscured.

This PR fixes that, making sure the padding, alignment and spacing is consistent with the other themes.

Note that the result of this is that the OPNsense logo is placed far left, with the hamburger icon to the right of it (rather than the opposite as currently).

---

Describe the proposed solution

As per above.

---

Related issue

N/A