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/settings.py

@@ -149,7 +149,7 @@ class InstalledExtensionsSettings(LNbitsSettings):
     lnbits_extensions_redirects: list[RedirectPath] = Field(default=[])
 
     # list of all extension ids
-    lnbits_all_extensions_ids: set[str] = Field(default=[])
+    lnbits_installed_extensions_ids: set[str] = Field(default=[])
 
     def find_extension_redirect(
         self, path: str, req_headers: list[tuple[bytes, bytes]]
@@ -182,7 +182,7 @@ class InstalledExtensionsSettings(LNbitsSettings):
         if ext_redirects:
             self._activate_extension_redirects(ext_id, ext_redirects)
 
-        self.lnbits_all_extensions_ids.add(ext_id)
+        self.lnbits_installed_extensions_ids.add(ext_id)
 
     def deactivate_extension_paths(self, ext_id: str):
         self.lnbits_deactivated_extensions.add(ext_id)
@@ -852,6 +852,8 @@ class TransientSettings(InstalledExtensionsSettings, ExchangeHistorySettings):
     # Remember the latest balance delta in order to compare with the current one
     latest_balance_delta_sats: int = Field(default=None)
 
+    lnbits_all_extensions_ids: set[str] = Field(default=[])
+
     @classmethod
     def readonly_fields(cls):
         return [f for f in inspect.signature(cls).parameters if not f.startswith("_")]
@@ -907,8 +909,8 @@ class Settings(EditableSettings, ReadOnlySettings, TransientSettings, BaseSettin
     def is_admin_extension(self, ext_id: str) -> bool:
         return ext_id in self.lnbits_admin_extensions
 
-    def is_extension_id(self, ext_id: str) -> bool:
-        return ext_id in self.lnbits_all_extensions_ids
+    def is_installed_extension_id(self, ext_id: str) -> bool:
+        return ext_id in self.lnbits_installed_extensions_ids
 
 
 class SuperSettings(EditableSettings):