feat: modernize error page (#2949)

* can't figure this out!

* raise here so it gets picked up by exceptions

* add few more info for error rendering

* add a few more checks for browser

not fail safe just one more layer

* cleaner error display

... hopefully

* add go to extension

* keep buttons add go to extension

* feat: identify extensions that are not installed

* fix: status code

* fix: full path

* add account/logout button if 401

prevent getting stuck

* fix: ext access

* fix user button

* fix: 404 page

* fix: json 404 response

* fix: dumb rendering

* fix: `/api` request always json

* fix: extension api path

* test: check regtest

* test: investgate

* something made ws slower?

* fix: change error code

---------

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>
Co-authored-by: dni ⚡ <office@dnilabs.com>
Co-authored-by: Arc <33088785+arcbtc@users.noreply.github.com>

lnbits/app.py

@@ -283,14 +283,14 @@ async def build_all_installed_extensions_list(
     MUST be installed by default (see LNBITS_EXTENSIONS_DEFAULT_INSTALL).
     """
     installed_extensions = await get_installed_extensions()
-    settings.lnbits_all_extensions_ids = {e.id for e in installed_extensions}
+    settings.lnbits_installed_extensions_ids = {e.id for e in installed_extensions}
 
     for ext_dir in Path(settings.lnbits_extensions_path, "extensions").iterdir():
         try:
             if not ext_dir.is_dir():
                 continue
             ext_id = ext_dir.name
-            if ext_id in settings.lnbits_all_extensions_ids:
+            if ext_id in settings.lnbits_installed_extensions_ids:
                 continue
             ext_info = InstallableExtension.from_ext_dir(ext_id)
             if not ext_info:
@@ -305,7 +305,7 @@ async def build_all_installed_extensions_list(
             logger.warning(e)
 
     for ext_id in settings.lnbits_extensions_default_install:
-        if ext_id in settings.lnbits_all_extensions_ids:
+        if ext_id in settings.lnbits_installed_extensions_ids:
             continue
 
         ext_releases = await InstallableExtension.get_extension_releases(ext_id)