impr(tape mode): support RTL languages (@NadAlaba)

[nadalaba]

Description

Other than the changes made in #5868, this PR has its changes in its last commit impr(tape mode): support RTL languages (@NadAlaba) which has the following changes:

1. In scrollTape():

   • Current language is await-checked if it's RTL, which requires scrollTape() to be async.
   • An edit to the calculation of the current word width in tape=letter explained in point 3 below.
   • In RTL, start #words margin-left by putting #words right edge in the center of #wordsWrapper (newMargin = - wordsEl.offsetWidth + wordsWrapperWidth/2), then put the first letter of the first word in that center (newMargin += wordRightMargin), and finally add words widths instead of subtracting them like in LTR.

2. scrollTape() becomeing async requires? it to be awaited in where it is called which requires the calling functions to become async, and the chain continues. Functions that were changed to async:

   • in test-ui.ts: callback in ConfigEvent.subscribe(), updateActiveElement(), updateWordWrapperClasses(), showWords(), updateWordsMargin(), callback in #words.animate.complete() in scrollTape().
   • in input-controller.ts: backspaceToPrevious(), callback in $("#wordsInput").on("input").
   • in ui.ts: callback in debouncedEvent().

3. Subtract the width of the last letter that has a positive width if the current letter has a zero width (e.g, diacritics). This is needed when calculation is based on letter widths instead of letter position, which is done in caret.ts when tape=word, and in scrollTape() when tape=letter.

4. Remove restriction on RTL tape mode from test-logic.ts.

closes #3923

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[Miodec]

Weird issue i ran into when testing this (sometimes words are slow to appear on the right)

https://github.com/user-attachments/assets/3f0b64fa-8875-49d0-aa77-171266996c08

[nadalaba]

Weird issue i ran into when testing this (sometimes words are slow to appear on the right)

Resolved!

Please merge #5824 before this to perform final test on this one.

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[nadalaba]

This is built on top of #5868, so it'd be easier to review that PR first

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