fix(tui): approval flow + input ergonomics + selection perf

- tui_gateway: route approvals through gateway callback (HERMES_GATEWAY_SESSION/
  HERMES_EXEC_ASK) so dangerous commands emit approval.request instead of
  silently falling through the CLI input() path and auto-denying
- approval UX: dedicated PromptZone between transcript and composer, safer
  defaults (sel=0, numeric quick-picks, no Esc=deny), activity trail line,
  outcome footer under the cost row
- text input: Ctrl+A select-all, real forward Delete, Ctrl+W always consumed
  (fixes Ctrl+Backspace at cursor 0 inserting literal w)
- hermes-ink selection: swap synchronous onRender() for throttled
  scheduleRender() on drag, and only notify React subscribers on presence
  change — no more per-cell paint/subscribe spam
- useConfigSync: silence config.get polling failures instead of surfacing
  'error: timeout: config.get' in the transcript

ui-tui/src/app/interfaces.ts

@@ -26,6 +26,7 @@ export interface StateSetter<T> {
 }
 
 export interface SelectionApi {
+  clearSelection: () => void
   copySelection: () => string
 }
 
@@ -275,6 +276,7 @@ export interface AppLayoutComposerProps {
 
 export interface AppLayoutProgressProps {
   activity: ActivityItem[]
+  outcome: string
   reasoning: string
   reasoningActive: boolean
   reasoningStreaming: boolean