fix(ios): make the IME composer reachable from the compact key bar

[hello532]

Refs #214.

Correction to the issue

I filed #214 guessing the input surface never implemented the iOS UITextInput
marked-text protocol. Reading the code, that guess was wrong in an important way:
IME input already works on iOS. KeyboardSupporter.buildComposeRow creates a real
UITextField, so UIKit drives composition inside it natively — Stroke, Pinyin,
Handwriting included.

The real problem is that the composer cannot be found and, in the default layout, cannot
be reached at all:

• the only entry point was a left swipe on the accessory bar — no button, no hint
• handlePan opened with guard extended else { return }, so the swipe was inert unless
  the two-row keypad was already showing
• extended defaults to false

On a fresh install the bar is compact, so the gesture does nothing and the composer is
unreachable. That presents exactly as "Chinese cannot be typed", which is how I
originally reported it.

Change

• Add a ⌨ key to compactRow that calls setComposing(true, animated: true).
  It is dispatched locally in buttonTouchUpInside and returns before sendKey, so
  zedra:composer is never forwarded to Rust as a keystroke.
• Drop the guard extended line in handlePan so the swipe works in both layouts.
  rebuildRows always builds the compose page, so nothing else gated this.
• Carry an optional accessibilityLabel on KeySpec and apply it in buildRow, so the
  new key announces as "Open composer" rather than as a glyph. This mirrors the existing
  close.accessibilityLabel = "Close composer".
• Update the file header comment, which still described the swipe as the only way in.

The extended rows are untouched: both are full at seven keys, and the swipe covers them.

Testing

swiftc -parse ios/Zedra/KeyboardSupporter.swift passes.

Not verified on a device or simulator. I have no iOS SDK on this machine
(xcrun --sdk iphoneos --show-sdk-path fails), so I could not build the app or confirm
the behaviour by hand, and CI only covers the Rust crates — nothing here is exercised by
it. The change is small and confined to one file, but it needs a real run before merge.
Two things worth checking:

1. Tapping ⌨ on the compact bar opens the composer with the keyboard focused, and
   Chinese can be typed and sent.
2. The swipe still behaves in the extended layout, and the eighth key does not crowd the
   compact row on smaller devices such as an iPhone SE.

Scope

This makes the existing composer usable. It does not add IME support to the terminal
surface itself — text typed straight into the terminal still bypasses composition,
because include/gpui_ios.h exposes only gpui_ios_handle_text_input(void*, void*),
which carries committed text and has no marked-text state in the ABI. Inline composition
in the terminal would mean extending that boundary plus the GPUI iOS platform layer in
the vendor/zed submodule (tanlethanh/zed@feat/gpui-mobile), which belongs in a
separate change. Happy to open an issue there if that is the direction you want.

Reported from iPhone, iOS 18.3.1, App Store build.

[tanlethanh]

Hey thanks @hello532. This is useful. But I also think that the terminal input itself should support typing in chinese directly without going though a composer input. I guess it should be related to IME and Marked Text, and can you also help me check at it?

[hello532]

你让ai来修复。 Tan Le ***@***.***>于2026年8月25日 周二11:46写道：

…

*tanlethanh* left a comment (deltaqdev/zedra#217) <#217 (comment)> Hey thanks @hello532 <https://github.com/hello532>. This is useful. But I also think that the terminal input itself should support typing in chinese directly without going though a composer input. I guess it should be related to IME and Marked Text, and can you also help me check at it? — Reply to this email directly, view it on GitHub <#217?email_source=notifications&email_token=AOF4R64VYKNV7PDZRYNEUB35LUD2XA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBQGQ4DCMZQG4Z2M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-5404813073>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOF4R65DQE56HLDFUXWZHWD5LUD2XAVCNFSNUABGKJSXA33TNF2G64TZHMYTCMRZGUYTQNBWGY5US43TOVSTWNJSGM2TONRRGEZDBILWAI> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/AOF4R64G4QSFURUGEW5L5RD5LUD2XA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBQGQ4DCMZQG4Z2M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/AOF4R67JYMCN3HBWGA3KQSL5LUD2XA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBQGQ4DCMZQG4Z2M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you were mentioned.Message ID: ***@***.***>

[tanlethanh]

I can fix it, but I doesnt know Chinese so it takes time for me to test it

[hello532]

你写完，发tf我测试。可以这么做。 留意帮你测 Tan Le ***@***.***>于2026年8月25日 周二11:51写道：

…

*tanlethanh* left a comment (deltaqdev/zedra#217) <#217 (comment)> I can fix it, but I doesnt know Chinese so it takes time for me to test it — Reply to this email directly, view it on GitHub <#217?email_source=notifications&email_token=AOF4R65JI642CMK52ZGUHAT5LUEMPA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBQGQ4DIMRXGM3KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-5404842736>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOF4R66VRLKKMIKCTDEI2CT5LUEMPAVCNFSNUABGKJSXA33TNF2G64TZHMYTCMRZGUYTQNBWGY5US43TOVSTWNJSGM2TONRRGEZDBILWAI> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/AOF4R64DEH7DLARML6KRFD35LUEMPA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBQGQ4DIMRXGM3KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/AOF4R632KAQUJJ2NRGIBY5T5LUEMPA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBQGQ4DIMRXGM3KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you were mentioned.Message ID: ***@***.***>