Convert glitch component SCSS to CSS custom properties (Phase 5+6)

Replace $var with var(--var), inline all mixins, unroll @each/@for,
convert color functions to pre-calculated properties. Merge properties
into variables.scss :root blocks, fix theme import order for CSS cascade.

Convert 17 SCSS files to CSS custom properties (Phase 3-4)

Replace $variables with var(--custom-properties), pre-calculated
color functions with themed custom properties, and unroll Sass
control flow (@each, @for, @extend) into plain CSS. Files keep
.scss extension during transition as index.scss still imports them.

Build: split CSS/SCSS webpack rules + generate CSS custom properties

- Split webpack css rule into separate .css and .scss rules so pure
  CSS files skip sass-loader (Phase 1)
- Generate properties.css for dark/light/contrast themes with all
  pre-calculated color values as CSS custom properties (Phase 2)
- Add extract-colors.js helper script for color value generation

Fix merged PR bugs and rewrite reduced-motion to pure CSS

- PR #64: fix typo "ad" → "add" in bookmark folder empty message
- PR #64: fix reducer using wrong key ('folder'/'title' → 'name')
- PR #84: implement confirm_unfollow using local_settings instead of
  server-side unfollowModal global
- PR #104: replace JS body-class approach with native CSS
  @media (prefers-reduced-motion) queries across all SCSS files
- Wide view: columns fill available space, content centered at 600px

Merge PR #64: Bookmark folders

Adds bookmark folder support: create/manage folders, assign bookmarks
to folders, browse bookmarks by folder. Also refactors alert/toast
system to support clickable actions.

From: mkljczk (https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/64)

[feature] decouple login.scss from variables (#93)

Preparing for a switch to CSS variables

- decouple login.scss from variables.scss
- move scrollbar css to separate file

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/93
Co-authored-by: Zoë Bijl <code@moiety.me>
Co-committed-by: Zoë Bijl <code@moiety.me>

[build] upgrade to Prettier 3.6.2 (#86)

Upgrades Prettier to 3.6.2 and pins it there. Prettier [recommends pinning the version](https://prettier.io/docs/install#summary):

> Install an exact version of Prettier locally in your project. This makes sure that everyone in the project gets the exact same version of Prettier. Even a patch release of Prettier can result in slightly different formatting, so you wouldn’t want different team members using different versions and formatting each other’s changes back and forth.

---

Should probably merge after #85.

Co-authored-by: tobi <kipvandenbos@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/86
Co-authored-by: Zoë Bijl <code@moiety.me>
Co-committed-by: Zoë Bijl <code@moiety.me>

[bugfix] Fix linter issues (#85)

- [x] .js
- [x] .json
- [x] .md
- [x] .scss
- [x] .yml

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/85
Co-authored-by: Zoë Bijl <code@moiety.me>
Co-committed-by: Zoë Bijl <code@moiety.me>

[feature] Redesigned login page (#76)

Reworked the login page

- Simplified some of the HTML and CSS
- Removed some `aria-label`s
- Added alt text for the logo
- Added a label for the input field
- Added subtle borders to otherwise flat elements

![redesigned login page with the mentioned changes](/attachments/53dc5c16-deac-4a68-912e-8a4486a93b53)

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/76
Co-authored-by: Zoë Bijl <code@moiety.me>
Co-committed-by: Zoë Bijl <code@moiety.me>

Bookmark folders support

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

port 'Add toast with option to open post after publishing in web UI'

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

[feature] Nicer login.html page, with cute styling + link to source code (#19)

Fixes #9

- Cute styling, combination of Mastodon and GTS
- Short description of the project
- Error and status messages (temporarily) appear in disabled button with correct ARIA attributes
- Sufficient contrast (WCAG AAA)

Let me know if using `login.scss` both as an index file and for adding custom styling is okay. I figured this might be preferred over creating an extra folder and file.

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/19
Co-authored-by: vyxen <vyxen@tutamail.com>
Co-committed-by: vyxen <vyxen@tutamail.com>

Add domain to acct display in sidebar

Merge remote-tracking branch 'upstream' into glitch

Merge pull request #2434 from ClearlyClaire/glitch-soc/merge-upstream

Merge upstream changes up to 640421f661ee4d7e76a2aab607e7b15687940b6f

[Glitch] Keep version string displayed without breakpoints in UI

Port 5a437edc7f22d5797e5af29d9b450a03eccec304 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

Merge pull request #2426 from ClearlyClaire/glitch-soc/merge-upstream

Merge upstream changes up to 57f592fed50747f3c97718a2761e17bafe6c8698

[Glitch] Fix line wrapping of language selection button with long locale codes

Port 88fa8e710adf103dee289b2a9cc691a410f97c21 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

Merge pull request #2406 from ClearlyClaire/glitch-soc/merge-upstream

Merge upstream changes up to 6273416292090b2f6bfda33f070cea325a1759df

Revert tabs background color so they are easier to visually distinguish from contents