Adjust tag and frame styles.
Fix the problem of tag highlights covering active tag.

…or value to lwt-accent-color, make rounded corners not default, hide the separator of adjacent tabs, remove active tab bold

Update theme styling to the Phoenix design

… devtool, update visual to latest Pheonix redesign

Update avatar icon visual on tab bar

Update floating tab shadow style

also includes:
* Fix various issues with bookmarks bar
* Removes the double separators from the context menu
* Updates the styling of the tab container indicator

This issue only occured when the bookmarks bar was set to only show on
the new tab page.

Adds translate and Firefox View icons. Also replaces the small arrow
seen in the context menus.

The bottom left corner of a tab can overlap the currently selected tab
if hovered over, this fixes the issue.

Also fixes icons not working in the sidebar selector menu.

Also fixes issues with the autocomplete popup.

Updates the URL bar appearance to match the newer Edge style. This is
most noticeable when the URL bar is expanded/opened.

Also changes the default text selection background to match the one
found in Edge.

This removes the 1px border that caused issues with the shadows, and
resolves an issue with the toolbars overlapping the shadow.

Clean and refactor tabbar.css, while adding some improvements:
 * Improve functionality of some selectors
 * Improve functionality of separators, toolbar buttons, and tabs.
 * Make the appearance closer to Edge.
 * Adding more comments, explaining functionality of complex selectors.

Updated screenshots for the thumbnail and previews. Linux/GTK screenshot
has been removed for now, but a new one will be added later.

Screenshots updated include:
 * Thumbnail (macOS)
 * Default (Windows 11)
 * Floating Tabs + Rounded Corners (Windows 11)
 * Hide Tabs Bar + Rounded Corners (macOS)

Fixes issue when in private browsing mode, the window control buttons
did not appear due to the private browsing indicator styling creating a
new containing block, preventing the position: absolute; on the titlebar
buttons from working correctly.

This commit changes them from absolute to fixed, so this should work
properly now.

This applies to the separate dedicated search bar.

Prevents tab scroll container styling from interfering with context menu
styling.

update formatting for "about:config" to match "about:support"

Also fixes colouring issue with force-tab-colour tweak and renames
--tab-block-margin to --uc-tab-top-margin as that is clearer name which
better describes what it actually changes.

The hide access key tweak removes the highlighting of characters from
context menu items.

The vertical context navigation tweak now supports different languages
as the label values are obtained from Firefox using the attr() function
instead of the being baked in to the stylesheet.

When changing the browser theme, switching back to the default,
sometimes the colour scheme is wrong in private windows.

This makes sure the urlbar input and suggestions icons are aligned
vertically.

Adds more variable for control over the size of elements, this is a step
towards supporting multiple density options.

Also improves theming support by adding the tab outline to the rounded
bottom corners of tabs.

… browser.css

Update visual of Pheonix Redesign and Bug fix

Also:
* fixes the position of the pinned tab title changed indicator
* changes the background colour of pages when loading

Also clean up and sort the theme colour variables.