Improve terminal input redraw latency

Keep terminal UI drawing glyphs on WebGL and bypass daemon stream batching for small redraws immediately after terminal input.

src/renderer/src/components/terminal-pane/pty-connection.test.ts

@@ -2102,6 +2102,31 @@ describe('connectPanePty', () => {
     expect(pane.terminal.write).toHaveBeenCalledWith('Arabic: السلام عليكم\r\n')
   })
 
+  it('keeps panes on WebGL for terminal UI drawing glyphs', async () => {
+    const { connectPanePty } = await import('./pty-connection')
+    const transport = createMockTransport()
+    const capturedDataCallback: { current: ((data: string) => void) | null } = { current: null }
+    transport.connect.mockImplementation(async ({ callbacks }: { callbacks: ConnectCallbacks }) => {
+      capturedDataCallback.current = callbacks.onData ?? null
+      return 'pty-id'
+    })
+    transportFactoryQueue.push(transport)
+
+    const pane = createPane(1)
+    const manager = createManager(1)
+    const deps = createDeps()
+
+    connectPanePty(pane as never, manager as never, deps as never)
+    await flushAsyncTicks(6)
+
+    capturedDataCallback.current?.('⠋ Working ├─ file.ts █ progress \uE0B0 prompt\r\n')
+
+    expect(manager.markPaneHasComplexScriptOutput).not.toHaveBeenCalled()
+    expect(pane.terminal.write).toHaveBeenCalledWith(
+      '⠋ Working ├─ file.ts █ progress \uE0B0 prompt\r\n'
+    )
+  })
+
   it('reattaches via daemon sessionId when an in-session PTY is live', async () => {
     const { connectPanePty } = await import('./pty-connection')
     const transport = createMockTransport()

src/renderer/src/lib/pane-manager/terminal-complex-script.test.ts

@@ -19,12 +19,15 @@ describe('terminalOutputPrefersDomRenderer', () => {
     expect(terminalOutputPrefersDomRenderer('Fullwidth: ＡＢＣ１２３')).toBe(true)
   })
 
-  it('detects glyph classes common in agent terminal UIs', () => {
-    expect(terminalOutputPrefersDomRenderer('⠋ Working')).toBe(true)
-    expect(terminalOutputPrefersDomRenderer('├─ file.ts')).toBe(true)
-    expect(terminalOutputPrefersDomRenderer('█ progress')).toBe(true)
-    expect(terminalOutputPrefersDomRenderer('◆ status')).toBe(true)
-    expect(terminalOutputPrefersDomRenderer('\uE0B0 prompt')).toBe(true)
+  it('keeps terminal drawing glyphs on WebGL', () => {
+    expect(terminalOutputPrefersDomRenderer('⠋ Working')).toBe(false)
+    expect(terminalOutputPrefersDomRenderer('├─ file.ts')).toBe(false)
+    expect(terminalOutputPrefersDomRenderer('█ progress')).toBe(false)
+    expect(terminalOutputPrefersDomRenderer('◆ status')).toBe(false)
+    expect(terminalOutputPrefersDomRenderer('\uE0B0 prompt')).toBe(false)
+  })
+
+  it('detects malformed replacement characters', () => {
     expect(terminalOutputPrefersDomRenderer('bad replacement �')).toBe(true)
   })
 

src/renderer/src/lib/pane-manager/terminal-complex-script.ts

@@ -1,5 +1,6 @@
-// Why: xterm WebGL renders from a glyph atlas; agent TUIs often combine glyphs
-// that are safer through the browser text path even when they are not RTL.
+// Why: xterm WebGL renders from a glyph atlas; actual complex text is safer
+// through the browser text path. Terminal UI drawing glyphs stay on WebGL
+// because xterm's custom-glyph renderer is built for those ranges.
 const EMOJI_PRESENTATION_PATTERN = /\p{Emoji_Presentation}/u
 
 function isInRange(value: number, start: number, end: number): boolean {
@@ -11,16 +12,12 @@ function isRendererRiskCodePoint(value: number): boolean {
     isInRange(value, 0x0590, 0x08ff) ||
     value === 0x200d ||
     isInRange(value, 0x1100, 0x11ff) ||
-    isInRange(value, 0x2500, 0x259f) ||
-    isInRange(value, 0x25a0, 0x25ff) ||
-    isInRange(value, 0x2800, 0x28ff) ||
     // Why: xterm WebGL can leave stale atlas cells for East Asian wide glyphs
     // on Windows; force browser text rendering before long CJK output paints.
     isInRange(value, 0x2e80, 0x9fff) ||
     isInRange(value, 0xa960, 0xa97f) ||
     isInRange(value, 0xac00, 0xd7ff) ||
     isInRange(value, 0xd800, 0xdfff) ||
-    isInRange(value, 0xe000, 0xf8ff) ||
     isInRange(value, 0xf900, 0xfaff) ||
     isInRange(value, 0xfe10, 0xfe1f) ||
     isInRange(value, 0xfe30, 0xfe4f) ||