Browser: bug fixes, animation and UI improvements

[christianbaroni]

What changed (plus any additional context for devs)

• Fixes homepage scrolling
• Fixes the screenshot flash that would sometimes happen when switching the active tab, by tying the screenshot display logic to the JS state that drives the WebView freezing
• Adds an extra guard to prevent currentlyOpenTabIds and tabStates from becoming out of sync, which I noticed happen a couple times when quickly closing tabs by tapping the X on each tab
  • The underlying problem that causes them to become out of sync is that the operation queue is unblocked after tabStates is set, rather than after the value of tabStates updates. However, I found it to be slow and unreliable unblocking the queue by listening for changes in tabStates. I’m sure there are better solutions, but for now I added an additional step to processOperationQueueWorklet that strips out any tabs in the updated tabStates object that don't at that moment exist in currentlyOpenTabIds. This should reliably fix all sync issues caused by quickly closing tabs, essentially by resolving any out-of-sync states that do occur on the fly, before they compound and become a problem.
• Makes it harder to miss when tapping the tab close X buttons
• Adds closeAllTabsWorklet, which we’ll want to use in the near future to allow closing all tabs
• Improves favorites URL standardization
• Improves website logo detection by covering more icon types and searching for the highest-res icon (currently stops searching at >= 180px or if an SVG is found)
  • The script is a little more complex now but it doesn’t seem to have any noticeable performance impact — I tried to keep it as efficient as possible
• Consolidates the website metadata into a single message
• Makes the tab view ScrollView height animate when the number of tab rows changes, which may also slightly improve performance because it removes the inline ScrollView height setting
• Adds an invisible autoscroll to vertically center the active tab in the tab view
  • As soon as a tab becomes fully open, the tab view is invisibly scrolled to ensure that if the tab view is re-entered, the active tab is centered vertically on the screen (or as close as possible if the tab is near the top or bottom of the list)
• Fixes a crash I noticed coming from AccountIcon, where in getActiveSession(), activeSessionAddress was defined but sessions was not
• Some minor misc. cleanup and tab operation type improvements

Screen recordings / screenshots

What to test

[brunobar79]

LGTM