diff --git a/mobile/app/h/[hostId]/files/[worktreeId].tsx b/mobile/app/h/[hostId]/files/[worktreeId].tsx
index 6f4caf65747..f758c569188 100644
--- a/mobile/app/h/[hostId]/files/[worktreeId].tsx
+++ b/mobile/app/h/[hostId]/files/[worktreeId].tsx
@@ -174,10 +174,7 @@ export default function MobileFileExplorerScreen() {
           throw new Error(response.error?.message || 'Unable to open file')
         }
         triggerSelection()
-        router.replace({
-          pathname: '/h/[hostId]/session/[worktreeId]',
-          params: { hostId, worktreeId, name: name ?? '' }
-        })
+        router.back()
       } catch (err) {
         triggerError()
         setError(err instanceof Error ? err.message : 'Unable to open file')
diff --git a/mobile/app/h/[hostId]/session/[worktreeId].tsx b/mobile/app/h/[hostId]/session/[worktreeId].tsx
index af40a566492..34a1fa333da 100644
--- a/mobile/app/h/[hostId]/session/[worktreeId].tsx
+++ b/mobile/app/h/[hostId]/session/[worktreeId].tsx
@@ -1581,7 +1581,7 @@ export default function SessionScreen() {
   useEffect(() => {
     if (activeSessionTab?.type !== 'markdown') return
     const doc = markdownDocs.get(activeSessionTab.id)
-    if (!doc || doc.status === 'error') {
+    if (!doc) {
       void readMarkdownTab(activeSessionTab)
     }
   }, [activeSessionTab, markdownDocs, readMarkdownTab])
@@ -1589,7 +1589,7 @@ export default function SessionScreen() {
   useEffect(() => {
     if (activeSessionTab?.type !== 'file') return
     const doc = fileDocs.get(activeSessionTab.id)
-    if (!doc || doc.status === 'error') {
+    if (!doc) {
       void readFileTab(activeSessionTab)
     }
   }, [activeSessionTab, fileDocs, readFileTab])
@@ -2456,8 +2456,15 @@ export default function SessionScreen() {
               const combined = drafts
                 .map((draft) => `# ${draft.title}\n\n${draft.content}`)
                 .join('\n\n---\n\n')
-              setLeaveDrafts(null)
-              void Clipboard.setStringAsync(combined).finally(() => router.back())
+              void Clipboard.setStringAsync(combined)
+                .then(() => {
+                  setLeaveDrafts(null)
+                  router.back()
+                })
+                .catch(() => {
+                  triggerError()
+                  showToast("Couldn't copy drafts", 1500)
+                })
             }
           },
           {
diff --git a/src/main/runtime/orca-runtime.ts b/src/main/runtime/orca-runtime.ts
index 3fe6595c2bf..965fb64e43b 100644
--- a/src/main/runtime/orca-runtime.ts
+++ b/src/main/runtime/orca-runtime.ts
@@ -122,6 +122,7 @@ import {
 } from '../git/repo'
 import { listWorktrees, addWorktree, removeWorktree } from '../git/worktree'
 import { listQuickOpenFiles } from '../ipc/filesystem-list-files'
+import { resolveAuthorizedPath } from '../ipc/filesystem-auth'
 import {
   createSetupRunnerScript,
   getEffectiveHooks,
@@ -1001,7 +1002,7 @@ export class OrcaRuntimeService {
     const filePath = joinWorktreeRelativePath(worktree.path, relativePath)
     const content = repo?.connectionId
       ? await this.readRemoteMobileFile(filePath, repo.connectionId)
-      : await readLocalMobileFile(filePath)
+      : await readLocalMobileFile(filePath, this.store as unknown as Store)
     const truncated = truncateMobileFilePreview(content)
 
     return {
@@ -7147,12 +7148,13 @@ function joinWorktreeRelativePath(rootPath: string, relativePath: string): strin
   return posix.join(rootPath, ...normalizedRelativePath.split('/'))
 }
 
-async function readLocalMobileFile(filePath: string): Promise<string> {
-  const fileStat = await stat(filePath)
+async function readLocalMobileFile(filePath: string, store: Store): Promise<string> {
+  const authorizedPath = await resolveAuthorizedPath(filePath, store)
+  const fileStat = await stat(authorizedPath)
   // Why: mobile file previews are read-only convenience views; cap the read so
   // opening a generated log or bundle cannot block the WebSocket like oversized scrollback.
   const readLimit = Math.min(fileStat.size, MOBILE_FILE_READ_MAX_BYTES + 1)
-  const handle = await open(filePath, 'r')
+  const handle = await open(authorizedPath, 'r')
   try {
     const buffer = Buffer.alloc(readLimit)
     const { bytesRead } = await handle.read(buffer, 0, readLimit, 0)
diff --git a/src/main/runtime/rpc/methods/session-tabs.ts b/src/main/runtime/rpc/methods/session-tabs.ts
index 547ff5933f9..9c2b4102dca 100644
--- a/src/main/runtime/rpc/methods/session-tabs.ts
+++ b/src/main/runtime/rpc/methods/session-tabs.ts
@@ -39,23 +39,31 @@ export const SESSION_TAB_METHODS: RpcAnyMethod[] = [
     name: 'session.tabs.subscribe',
     params: WorktreeTabSelector,
     handler: async (params, { runtime, connectionId }, emit) => {
-      const initial = await runtime.listMobileSessionTabs(params.worktree)
-      emit({ type: 'snapshot', ...initial })
-
-      const unsubscribe = runtime.onMobileSessionTabsChanged((snapshot) => {
-        if (snapshot.worktree === initial.worktree) {
-          emit({ type: 'updated', ...snapshot })
-        }
-      })
-      const subscriptionId = `session.tabs:${connectionId ?? 'local'}:${initial.worktree}`
+      let subscribedWorktree: string | null = null
+      let unsubscribe = (): void => {}
+      let closed = false
+      const subscriptionId = `session.tabs:${connectionId ?? 'local'}:${params.worktree}`
       runtime.registerSubscriptionCleanup(
         subscriptionId,
         () => {
+          closed = true
           unsubscribe()
           emit({ type: 'end' })
         },
         connectionId
       )
+      const initial = await runtime.listMobileSessionTabs(params.worktree)
+      if (closed) {
+        return
+      }
+      subscribedWorktree = initial.worktree
+      emit({ type: 'snapshot', ...initial })
+
+      unsubscribe = runtime.onMobileSessionTabsChanged((snapshot) => {
+        if (snapshot.worktree === subscribedWorktree) {
+          emit({ type: 'updated', ...snapshot })
+        }
+      })
     }
   }),
   defineMethod({
@@ -63,6 +71,7 @@ export const SESSION_TAB_METHODS: RpcAnyMethod[] = [
     params: WorktreeTabSelector,
     handler: async (params, { runtime, connectionId }) => {
       const snapshot = await runtime.listMobileSessionTabs(params.worktree)
+      runtime.cleanupSubscription(`session.tabs:${connectionId ?? 'local'}:${params.worktree}`)
       runtime.cleanupSubscription(`session.tabs:${connectionId ?? 'local'}:${snapshot.worktree}`)
       return { unsubscribed: true }
     }
diff --git a/src/main/runtime/rpc/methods/terminal.ts b/src/main/runtime/rpc/methods/terminal.ts
index 4975821d6c3..ae1224704be 100644
--- a/src/main/runtime/rpc/methods/terminal.ts
+++ b/src/main/runtime/rpc/methods/terminal.ts
@@ -561,6 +561,31 @@ export const TERMINAL_METHODS: RpcAnyMethod[] = [
       let closed = false
       let buffering = true
       const pendingOutput: string[] = []
+      let unsubscribeData = (): void => {}
+      let unsubscribeResize = (): void => {}
+      let unsubscribeFit = (): void => {}
+      let resolveStream = (): void => {}
+      const streamClosed = new Promise<void>((resolve) => {
+        resolveStream = resolve
+      })
+      // Why: register cleanup before any mobile-fit or snapshot await. A phone
+      // can disconnect mid-subscribe; cleanup must still remove mobile presence.
+      const subscriptionId = clientId ? `${params.terminal}:${clientId}` : params.terminal
+      runtime.registerSubscriptionCleanup(
+        subscriptionId,
+        () => {
+          closed = true
+          unsubscribeData()
+          unsubscribeResize()
+          unsubscribeFit()
+          if (isMobile && clientId) {
+            runtime.handleMobileUnsubscribe(ptyId, clientId)
+          }
+          emit({ type: 'end' })
+          resolveStream()
+        },
+        connectionId
+      )
       const sendFrame = (
         opcode: TerminalStreamOpcode,
         payload: Uint8Array<ArrayBufferLike> = new Uint8Array()
@@ -571,80 +596,86 @@ export const TERMINAL_METHODS: RpcAnyMethod[] = [
         sendBinary(encodeTerminalStreamFrame({ opcode, streamId, seq: cursor++, payload }))
       }
       // Server-side auto-fit: resize PTY to phone dims before serializing scrollback
-      if (isMobile && clientId) {
-        await runtime.handleMobileSubscribe(ptyId, clientId, params.viewport)
-      }
-
-      const unsubscribeData = runtime.subscribeToTerminalData(ptyId, (data) => {
+      try {
+        if (isMobile && clientId) {
+          await runtime.handleMobileSubscribe(ptyId, clientId, params.viewport)
+        }
         if (closed) {
           return
         }
-        if (buffering) {
-          pendingOutput.push(data)
+
+        unsubscribeData = runtime.subscribeToTerminalData(ptyId, (data) => {
+          if (closed) {
+            return
+          }
+          if (buffering) {
+            pendingOutput.push(data)
+            return
+          }
+          sendBinary!(
+            encodeTerminalStreamFrame({
+              opcode: TerminalStreamOpcode.Output,
+              streamId,
+              seq: cursor++,
+              payload: encodeTerminalStreamText(data)
+            })
+          )
+        })
+
+        const read = await runtime.readTerminal(params.terminal)
+        const serialized = await serializeBudgetedMobileSnapshot(runtime, ptyId, true)
+        if (closed) {
           return
         }
-        sendBinary!(
-          encodeTerminalStreamFrame({
-            opcode: TerminalStreamOpcode.Output,
-            streamId,
-            seq: cursor++,
-            payload: encodeTerminalStreamText(data)
-          })
-        )
-      })
+        const size = runtime.getTerminalSize(ptyId)
+        const displayMode = runtime.getMobileDisplayMode(ptyId)
+        // Why: emit the current layout seq with the initial scrollback so
+        // the mobile client's stale-event filter knows the high-water mark.
+        // Undefined when the PTY has never transitioned (filter is fail-open).
+        // See docs/mobile-terminal-layout-state-machine.md.
+        const seq = runtime.getLayout(ptyId)?.seq
+        emit({
+          type: 'subscribed',
+          streamId,
+          lines: read.tail,
+          truncated: read.truncated,
+          cols: serialized?.cols ?? size?.cols,
+          rows: serialized?.rows ?? size?.rows,
+          displayMode,
+          seq
+        })
+        const snapshotStats = sendSnapshotFrames(sendFrame, {
+          kind: 'scrollback',
+          cols: serialized?.cols ?? size?.cols ?? 80,
+          rows: serialized?.rows ?? size?.rows ?? 24,
+          displayMode,
+          seq,
+          truncated: read.truncated,
+          truncatedByByteBudget: serialized?.truncatedByByteBudget,
+          data: serialized?.data ?? ''
+        })
+        console.log('[mobile-terminal-stream] snapshot', {
+          terminal: params.terminal,
+          streamId,
+          kind: 'scrollback',
+          bytes: snapshotStats.bytes,
+          chunks: snapshotStats.chunks,
+          scrollbackRows: serialized?.scrollbackRows,
+          truncatedByByteBudget: serialized?.truncatedByByteBudget === true
+        })
+        buffering = false
+        for (const item of pendingOutput.splice(0)) {
+          sendBinary!(
+            encodeTerminalStreamFrame({
+              opcode: TerminalStreamOpcode.Output,
+              streamId,
+              seq: cursor++,
+              payload: encodeTerminalStreamText(item)
+            })
+          )
+        }
 
-      const read = await runtime.readTerminal(params.terminal)
-      const serialized = await serializeBudgetedMobileSnapshot(runtime, ptyId, true)
-      const size = runtime.getTerminalSize(ptyId)
-      const displayMode = runtime.getMobileDisplayMode(ptyId)
-      // Why: emit the current layout seq with the initial scrollback so
-      // the mobile client's stale-event filter knows the high-water mark.
-      // Undefined when the PTY has never transitioned (filter is fail-open).
-      // See docs/mobile-terminal-layout-state-machine.md.
-      const seq = runtime.getLayout(ptyId)?.seq
-      emit({
-        type: 'subscribed',
-        streamId,
-        lines: read.tail,
-        truncated: read.truncated,
-        cols: serialized?.cols ?? size?.cols,
-        rows: serialized?.rows ?? size?.rows,
-        displayMode,
-        seq
-      })
-      const snapshotStats = sendSnapshotFrames(sendFrame, {
-        kind: 'scrollback',
-        cols: serialized?.cols ?? size?.cols ?? 80,
-        rows: serialized?.rows ?? size?.rows ?? 24,
-        displayMode,
-        seq,
-        truncated: read.truncated,
-        truncatedByByteBudget: serialized?.truncatedByByteBudget,
-        data: serialized?.data ?? ''
-      })
-      console.log('[mobile-terminal-stream] snapshot', {
-        terminal: params.terminal,
-        streamId,
-        kind: 'scrollback',
-        bytes: snapshotStats.bytes,
-        chunks: snapshotStats.chunks,
-        scrollbackRows: serialized?.scrollbackRows,
-        truncatedByByteBudget: serialized?.truncatedByByteBudget === true
-      })
-      buffering = false
-      for (const item of pendingOutput.splice(0)) {
-        sendBinary!(
-          encodeTerminalStreamFrame({
-            opcode: TerminalStreamOpcode.Output,
-            streamId,
-            seq: cursor++,
-            payload: encodeTerminalStreamText(item)
-          })
-        )
-      }
-
-      await new Promise<void>((resolve) => {
-        const unsubscribeResize = runtime.subscribeToTerminalResize(ptyId, (event) => {
+        unsubscribeResize = runtime.subscribeToTerminalResize(ptyId, (event) => {
           // Why: true PTY geometry changes should be followed by the TUI's
           // redraw output, not a full scrollback replay. The client resizes
           // xterm geometry and consumes subsequent live output on this stream.
@@ -661,7 +692,7 @@ export const TERMINAL_METHODS: RpcAnyMethod[] = [
         })
 
         // Legacy fit-override-changed for non-mobile (desktop) subscribers
-        const unsubscribeFit = !isMobile
+        unsubscribeFit = !isMobile
           ? runtime.subscribeToFitOverrideChanges(ptyId, (event) => {
               emit({
                 type: 'fit-override-changed',
@@ -671,28 +702,12 @@ export const TERMINAL_METHODS: RpcAnyMethod[] = [
               })
             })
           : () => {}
+      } catch (error) {
+        runtime.cleanupSubscription(subscriptionId)
+        throw error
+      }
 
-        // Why: composite subscriptionId per (terminal, clientId) so two
-        // mobile clients subscribing to the same terminal handle do not
-        // evict each other via registerSubscriptionCleanup's
-        // duplicate-key cleanup. See docs/mobile-presence-lock.md.
-        const subscriptionId = clientId ? `${params.terminal}:${clientId}` : params.terminal
-        runtime.registerSubscriptionCleanup(
-          subscriptionId,
-          () => {
-            closed = true
-            unsubscribeData()
-            unsubscribeResize()
-            unsubscribeFit()
-            if (isMobile && clientId) {
-              runtime.handleMobileUnsubscribe(ptyId, clientId)
-            }
-            emit({ type: 'end' })
-            resolve()
-          },
-          connectionId
-        )
-      })
+      await streamClosed
     }
   }),
   defineMethod({