This PR removes the "dot" prefix value from the `#suggestions` list's entries and adds it back via CSS instead. It makes styling easier and less hacky for those who are interested, removing the dot with just styles is currently not as easy as I would like it to be.

* [mod] client/simple: client plugins

Defines a new interface for client side *"plugins"* that coexist with server
side plugin system. Each plugin (e.g., `InfiniteScroll`) extends the base
`ts Plugin`. Client side plugins are independent and lazy‑loaded via `router.ts`
when their `load()` conditions are met. On each navigation request, all
applicable plugins are instanced.

Since these are client side plugins, we can only invoke them once DOM is fully
loaded. E.g. `Calculator` will not render a new `answer` block until fully
loaded and executed.

For some plugins, we might want to handle its availability in `settings.yml`
and toggle in UI, like we do for server side plugins. In that case, we extend
`py Plugin` instancing only the information and then checking client side if
[`settings.plugins`](https://github.com/inetol/searxng/blob/1ad832b1dc33f3f388da361ff2459b05dc86a164/client/simple/src/js/toolkit.ts#L134)
array has the plugin id.

* [mod] client/simple: rebuild static

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Uses the deprecated [`execCommand()`](https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand)
to copy content to clipboard if accessing the instance through HTTP, this method
isn't going away soon.

Closes https://github.com/searxng/searxng/issues/5359

This PR adds a new result type: File

    Python class: searx/result_types/file.py
    Jinja template: searx/templates/simple/result_templates/file.html
    CSS (less) client/simple/src/less/result_types/file.less

Class 'File' (singular) replaces template 'files.html' (plural).  The renaming
was carried out because there is only one file (singular) in a result. Not to be
confused with the category 'files' where in multiple results can exist.

As mentioned in issue [1], the class '.category-files' was removed from the CSS
and the stylesheet was adopted in result_types/file.less (there based on the
templates and no longer based on the category).

[1] https://github.com/searxng/searxng/issues/5198

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Previously, when using a search url copied from the cookies tab, clicking
at the settings icon at the top right would show the browser preferences
and not the preferences that were set and used with the search url.
Please see https://github.com/searxng/searxng/issues/5227 for more information.

To test:
- change some preferences
- copy the preferences search url in the settings' cookies tab
- reset the preferences or clear cookies
- paste the copied search url into the search bar to search for something
- press the settings icon
- you can now see/preview the actual settings that were used for the search
- by pressing 'save', you can keep these preferences

closes #5227

This patch adds a new result type: Paper

- Python class:   searx/result_types/paper.py
- Jinja template: searx/templates/simple/result_templates/paper.html
- CSS (less)      client/simple/src/less/result_types/paper.less

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

This patch adds a new result type: Code

- Python class:   searx/result_types/code.py
- Jinja template: searx/templates/simple/result_templates/code.html
- CSS (less)      client/simple/src/less/result_types/code.less

Signed-of-by: Markus Heiser <markus.heiser@darmarIT.de>