style(buttons): remove FA-specific chevron icon size workaround

[tanyaka]

Summary

• Removes the .vs__open-indicator-button svg size override that was added to compensate for Font Awesome chevron icons rendering smaller than MDI equivalents
• This workaround is no longer needed since MDI icons are now used

[Copilot]

Pull request overview

This PR removes a CSS size override that targeted a Vue Select open-indicator chevron SVG (.vs__open-indicator-button svg), which was previously used as a Font Awesome-specific workaround and is no longer needed.

Changes:

• Removed the .vs__open-indicator-button svg { height/width: 24px; } workaround from the buttons stylesheet.

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[printminion-co]

Pushed 5 revert commits on top of this PR for review (please drop / squash / amend as appropriate):

• 32de3f3 revert 5a60a29 — sub-navigation toggle icon size (was the unfinished half of b7c4b80's FA story; "v30.0.5 update" is moot at v33)
• 624ffa2 revert 88860e1 — breadcrumb icon separator size (also originally framed as v30.0.5)
• c7b0686 revert b7c4b80 — explicit FA chevron / sub-nav size bump
• fe5adce revert 9c1cc6c — explicit FA navigation-entry icon size
• eba8783 revert 8843e2b — explicit FA chevron + sub-nav height

Net effect on top of your existing change:

• css/files.css — .vue-crumb__separator loses width:16px; height:16px;, keeps color
• css/navigation.css — both span[role=img]>svg rules (inside .app-navigation-entry and .button-vue--icon-only:not(.app-navigation-toggle)) lose their pixel sizes, keep color
• css/buttons.css — unchanged (your PR already deletes the chevron block)

Conflicts during revert (resolved here, please double-check):

• b7c4b80 / 8843e2b buttons.css portions → block already removed by your PR, accepted the deletion
• b7c4b80 navigation.css → kept color token at the current var(--ion-button-sidebar-text) (not the older --ion-color-secondary)
• 9c1cc6c navigation.css → kept the color line that the darkmode commit (ca6e63c) added later, dropped only the size lines

Borderline — not reverted, please decide: c96e222 styles(files): fix grid folder-icon icon size due to v30.0.7 update. Its diff is mixed (selector specificity tightening plus min-height 60→80%) — the selector change looks like a real v33-DOM fix, not an FA workaround, so I left it alone.

Visual checks before merge: file navigator sidebar icons, sub-navigation toggle, breadcrumb separator, sort/breadcrumb dropdown chevron.

[printminion-co]

please read commits and comment