[mod] client/simple: client plugins (#5406)

* [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

1 files changed, 1 insertions, 0 deletions

diff --git a/searx/static/themes/simple/chunk/13gvpunf.min.js.map b/searx/static/themes/simple/chunk/13gvpunf.min.js.map
new file mode 100644
index 000000000..540197af5
--- /dev/null
+++ b/searx/static/themes/simple/chunk/13gvpunf.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"13gvpunf.min.js","names":["assertElement: AssertElement"],"sources":["../../../../../client/simple/src/js/util/assertElement.ts"],"sourcesContent":["// SPDX-License-Identifier: AGPL-3.0-or-later\n\ntype AssertElement = <T>(element?: T | null) => asserts element is T;\nexport const assertElement: AssertElement = <T>(element?: T | null): asserts element is T => {\n  if (!element) {\n    throw new Error(\"DOM element not found\");\n  }\n};\n"],"mappings":"AAGA,MAAaA,EAAmC,GAA6C,CAC3F,GAAI,CAAC,EACH,MAAU,MAAM,wBAAwB"}
\ No newline at end of file