* FIX: Ensure slow mode duration is correctly edited and displayed.
This commit fixes a bug where you were forced to set hours, minutes, and seconds or you won't be able to set the slow mode. Also, the duration was not displayed correctly due to the seconds not being truncated.
Additionally, we'll always display the hours, minutes, and seconds inputs for clarity and remove the blue banner.
* Set slow mode modal tweaks.
Uses labels instead of placeholders.
Input fields only visible when custom option selected.
Replace "Custom Duration" with "Pick Duration".
Additionally, place the `Set slow mode` button at the bottom of the topic actions menu.
* Perform the slow_mode validation also on the client-side before saving trying to save the post. This way, the post won't be staged.
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