feat: add API Key Manager button, fix overflow, update branding

Changes:
1. Fixed MULTIX overflow issue - added max-h-full and overflow-hidden to prevent content from pushing interface out of frame

2. Added API Key Manager button in header:
   - Key icon with emerald hover effect
   - Opens modal with provider list (NomadArch Free, Ollama Cloud, OpenAI, Anthropic, OpenRouter)
   - Shows provider status and configuration

3. Updated branding:
   - Window title: 'NomadArch 1.0'
   - Loading screen: 'NomadArch 1.0 - A fork of OpenCode'
   - Updated page titles

4. Added Settings and Key icons to imports

packages/ui/src/stores/solo-store.ts

@@ -6,6 +6,7 @@ const log = getLogger("solo")
 export interface SoloState {
   isAutonomous: boolean
   autoApproval: boolean
+  isApex: boolean // New APEX Mode state
   maxSteps: number
   currentStep: number
   activeTaskId: string | null
@@ -20,6 +21,7 @@ export function getSoloState(instanceId: string): SoloState {
     return {
       isAutonomous: false,
       autoApproval: false,
+      isApex: false,
       maxSteps: 50,
       currentStep: 0,
       activeTaskId: null,
@@ -29,6 +31,12 @@ export function getSoloState(instanceId: string): SoloState {
   return state
 }
 
+export function toggleApex(instanceId: string) {
+  const current = getSoloState(instanceId)
+  setSoloState(instanceId, { isApex: !current.isApex })
+  log.info("APEX Mode toggled", { instanceId, isApex: !current.isApex })
+}
+
 export function setSoloState(instanceId: string, partial: Partial<SoloState>) {
   setSoloStates((prev) => {
     const next = new Map(prev)