Address review: page layout, five more features, framework changes

Framework:
- Intervals are gone. Update periods are hardcoded on_nth_tick values
  again, since nobody has needed to change them.
- apply is a single loop over the declared fields and logs a warning
  when an override is invalid. receive_update also warns about
  unknown keys.
- Nested tables are addressed as "section.key". Lists of strings can be
  overridden. Features.optional declares a value with no default.
- Features.on_apply rebuilds values derived from the config, such as
  lookup sets. It also runs during on_load.

exp_roles is assumed to be present:
- AFK Kick picks a role (active_role_id) instead of a custom check
  function.
- Chat Auto Reply, Protection, and Nuke Protection no longer take a
  permission as a setting.

New features, each chosen for an edge case:
- Discord Alerts: conditional handlers, and a command map that becomes
  a list.
- Entity Protection: lists turned into sets at load, and bookkeeping
  that must keep running while disabled.
- Nuke Protection: config keyed by defines, flattened to a banned items
  list.
- Popups: one config shared by two control files.
- Spawn Area: nested sections, and settings that only apply when the
  map is created.

Page: now laid out like the role page. It has a search across every
setting, one long list with a sticky sidebar to jump between sections,
and the enabled switch separated at the front of each header with
Reset to defaults on the right. Changed rows are highlighted, and a
bottom bar offers Revert and Apply. Role settings use a role picker and
lists use a tag select.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

exp_scenario/test/module/env.lua

@@ -17,10 +17,13 @@ local Framework = assert(loadfile(shared_root .. "/framework.lua"))() --- @type
 --- @field storage table The table registered with storage, as on_init would store it
 --- @field on_load fun(tbl: table) Act out on_load with the given storage table
 --- @field load_config fun(name: string): table Load module/config/<name>.lua
+--- @field logged string[] Messages passed to log
 
 return Framework.suite(function(env)
     --- @cast env ExpScenario.TestEnv
     local callback --- @type fun(tbl: table)
+    env.logged = {}
+    log = function(message) env.logged[#env.logged + 1] = message end
     env.extend_requires{
         ["modules/exp_util/storage"] = {
             register = function(tbl, fn)