fix(mobile): harden native-chat resize suppression

mobile/src/terminal/terminal-viewport-refit-state.ts

@@ -7,6 +7,7 @@ export type TerminalViewportRefitTargetState = {
   expectedHandle: string
   currentRef: unknown
   expectedRef: unknown
+  nativeChatCovered: boolean
   disposed: boolean
   runSeq: number
   currentRunSeq: number
@@ -94,6 +95,7 @@ export function isTerminalViewportRefitTargetCurrent(
   state: TerminalViewportRefitTargetState
 ): boolean {
   return (
+    !state.nativeChatCovered &&
     !state.disposed &&
     state.runSeq === state.currentRunSeq &&
     state.activeHandle === state.expectedHandle &&

mobile/src/terminal/terminal-viewport-refit.test.ts

@@ -313,6 +313,7 @@ describe('terminal viewport refit', () => {
       expectedHandle: 'term-1',
       currentRef: expectedRef,
       expectedRef,
+      nativeChatCovered: false,
       disposed: false,
       runSeq: 2,
       currentRunSeq: 2
@@ -325,5 +326,8 @@ describe('terminal viewport refit', () => {
     ).toBe(false)
     expect(isTerminalViewportRefitTargetCurrent({ ...current, currentRunSeq: 3 })).toBe(false)
     expect(isTerminalViewportRefitTargetCurrent({ ...current, disposed: true })).toBe(false)
+    expect(isTerminalViewportRefitTargetCurrent({ ...current, nativeChatCovered: true })).toBe(
+      false
+    )
   })
 })

mobile/src/terminal/terminal-viewport-refit.ts

@@ -116,6 +116,7 @@ export function useTerminalViewportRefit(
             expectedHandle: handle,
             currentRef: terminalRefs.current.get(handle),
             expectedRef: ref,
+            nativeChatCovered: nativeChatCoveredRef.current,
             disposed: disposedRef.current,
             runSeq,
             currentRunSeq: refitRunSeqRef.current

src/main/runtime/rpc/methods/terminal.ts

@@ -2540,7 +2540,8 @@ export const TERMINAL_METHODS: RpcAnyMethod[] = [
           .then(() => runtime.cleanupSubscription(subscriptionId))
           .catch(() => runtime.cleanupSubscription(subscriptionId))
         try {
-          await runtime.handleMobileSubscribe(ptyId, clientId, params.viewport)
+          // Why: a lease-only subscriber has no terminal view, so its cached viewport must never phone-fit the PTY.
+          await runtime.handleMobileSubscribe(ptyId, clientId, undefined)
           if (closed || signal?.aborted) {
             // Why: a disconnect can win the awaited subscribe and resurrect mobile presence after cleanup already released it.
             runtime.handleMobileUnsubscribe(ptyId, clientId)

src/main/runtime/rpc/terminal-subscribe-lease-only.test.ts

@@ -12,12 +12,13 @@ const request: RpcRequest = {
   params: {
     terminal: 'terminal-1',
     client: { id: 'phone-1', type: 'mobile' },
+    viewport: { cols: 40, rows: 20 },
     capabilities: { terminalBinaryStream: 1, mobileInputLeaseOnly: 1 }
   }
 }
 
 describe('terminal lease-only subscription', () => {
-  it('keeps mobile input ownership without registering output delivery', async () => {
+  it('keeps mobile input ownership without viewport resize or output delivery', async () => {
     const messages: string[] = []
     const cleanups = new Map<string, () => void>()
     const runtime = {