Note this commit also introduce a new {{d-popover}} component, example usage:
```hbs
{{#d-popover |state|}}
{{d-button label="foo.things" class="d-popover-trigger"}}
<div class="d-popover-content">
Some content
<div>
{{/d-popover}}
```
It's very easy to forget to add `require 'rails_helper'` at the top of every core/plugin spec file, and omissions can cause some very confusing/sporadic errors.
By setting this flag in `.rspec`, we can remove the need for `require 'rails_helper'` entirely.
This allows text editors to use correct syntax coloring for the heredoc sections.
Heredoc tag names we use:
languages: SQL, JS, RUBY, LUA, HTML, CSS, SCSS, SH, HBS, XML, YAML/YML, MF, ICS
other: MD, TEXT/TXT, RAW, EMAIL
This also switches to using the NPM package for better build stability. And adds a clearer label in the alert that is displayed to show your current timezone (when changing timezones).
New range tag for local dates with syntax like:
```
[date-range from=2022-01-06T13:00 to=2022-01-08 timezone=Australia/Sydney]
```
Previously, 2 dates in one line were considered as range. It was hard to decide if 2 dates are range when they were in separate lines or have some content between them.
New explicit tag should clearly distinguish between single date and range.
Common code from `addLocalDate` is extracted to `addSingleLocalDate`.
Both `addLocalDate` and new `addLocalRange` are using `addSingleLocalDate`.
Also, `defaultDateConfig` was extracted to have one place for all possible parameters.
Multiple polls can be created without the min attribute but that means
the attribute defaults to 1. A default of 0 does not make any sense
because it is equivalent to saying that a user is not casting any votes.
Centralizes calculations in a helper under the site header component.
This also reverts a small CSS change to the composer: since ac79c5ef,
the composer height was not including the grippie, which means that the
composer height was off by 11 pixels, and the topic progress widget was
sometimes being displayed cut off by 11 pixels.
A follow-up to #15117 and #15141. Applies the previous changes to PM-specific fields, makes the preview area take the all the available height of the composer, and unifies more spacing between composer elements.
