refactor(tui): event-loop foundation — actions, reducers, effects, Panel

Tasks 1.1–3.3 of docs/plans/2026-05-17-tui-refactor.md:

- Mosaic 0.13 → 0.18; Kotlin 2.0.21 → 2.2.10 (required by Mosaic).
  Fix MaxLineLength regressions in core/kernel orchestration logs.
- Input: drop raw System.in reader and ANSI escape parser. Wire
  Modifier.onKeyEvent at root; MosaicKeyMapper → KeyResolver → Action.
- State: split TuiState into Connection/Sessions/Input/Approval/Provider
  slices. Add InputMode.SteeringNote; delete handleSteer/System.console.
- Reducers: pure RootReducer composes slice reducers returning
  (state, List<Effect>). Effect is sealed (SendWs, Quit). Single
  dispatch(action) point in TuiApp; one coroutine drains effects.
- TuiWsClient now exposes messages/connection SharedFlows; suspend
  callbacks gone. ConnectionEvent sealed type added.
- Rendering: Panel(title){…} composable with LocalTerminalSize
  composition local; drop BOX_WIDTH and hand-padding from every
  component. Poll stty size every 500ms.
- Tests: KeyResolver (18) + 5 reducer suites (37). 55 total in :apps:tui.

Pending tasks 4.1–5.2 tracked in
docs/plans/2026-05-17-tui-refactor.progress.md.

build.gradle

@@ -3,15 +3,15 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    id 'org.jetbrains.kotlin.jvm' version '2.0.21' apply false
-    id 'org.jetbrains.kotlin.plugin.serialization' version '2.0.21' apply false
-    id 'org.jetbrains.kotlin.plugin.compose' version '2.0.21' apply false
+    id 'org.jetbrains.kotlin.jvm' version '2.2.10' apply false
+    id 'org.jetbrains.kotlin.plugin.serialization' version '2.2.10' apply false
+    id 'org.jetbrains.kotlin.plugin.compose' version '2.2.10' apply false
     id "io.gitlab.arturbosch.detekt" version "1.23.7"
     id "org.jetbrains.kotlinx.kover" version "0.8.3"
 }
 
 ext {
-    kotlin_version = '2.0.21'
+    kotlin_version = '2.2.10'
     kotlinx_coroutines_version = '1.9.0'
     kotlinx_serialization_version = '1.7.3'
     kotlinx_datetime_version = '0.6.2'