fix(mobile): show the Android code block copy icon

[X2Borgo]

Problem

On Android, fenced code blocks in chat (and in markdown file previews) show their header copy button as an empty rounded square. Tapping it still copies, but neither the copy icon nor the "copied" checkmark is drawn. iOS is unaffected.

Reproduce: open any thread on the Android app whose assistant reply contains a fenced code block, and look at the top-right of the block header.

Change

Android renders markdown through the native module, so code fences use NativeCodeBlock, which mounts the module's own CopyTextButton (apps/mobile/modules/t3-markdown-text/src/CopyTextButton.tsx). That button passed SF Symbol names to expo-symbols as plain strings. expo-symbols only treats a string as an iOS SF Symbol, so on Android the name resolves to null and nothing renders inside the button.

The button now passes { ios, android } names for both states, the same names the app-level apps/mobile/src/components/CopyTextButton.tsx uses: doc.on.doc / content_copy for copy, and checkmark / check for copied. iOS still receives the same SF Symbols.

The module doesn't import the app's AppSymbol wrapper. No module under apps/mobile/modules imports app code, and AppSymbol depends on Uniwind and Tabler. Using the raw expo-symbols Android path adds no new cost: the module already imports it on Android, and its SymbolView loads the bundled Material Symbols font on mount even when the name is missing.

Scope and approval

Fixes #13376. That issue is a triaged bug (bug, accepted) with a maintainer diagnosis that identifies this exact file and cause.

The same one-line approach was proposed in #13580. That PR was closed for missing device verification, not for the code. This PR adds the on-device before/after evidence it lacked.

One file changed: the module's copy button. No other behavior changes.

Verification

Checked on a Samsung Galaxy S22 (SM-S901B), Android 16, against a T3 Code server running 0.0.46-nightly.20261007. Both screenshots show the same code block in the same thread.

Before (installed T3 Code 2.0.0, build 77)	After, copy icon	After, checkmark right after tapping

Build for "after": the T3 Code Dev (com.t3tools.t3code.dev) debug development client, built locally with expo prebuild --clean --platform android and expo run:android (the android:dev script) from commit 82212f6, with JS served by Metro from this branch.

Manual checks on that device:

• The chat code block header shows the copy icon.
• Tapping it shows the checkmark (screenshot taken about 0.3 s after the tap).

Not checked: the clipboard contents after the tap (this change doesn't touch the copy call), the markdown file preview (it uses the same button), and iOS on a device. The iOS names are unchanged, and SymbolView.ios reads name.ios. No unit test added: the change is a static icon name, and a test would only mirror the implementation.

Static checks: tsc --noEmit in apps/mobile passes.

Agent-assisted: Claude Opus 5.5 (Claude Code, in T3 Code).

[macroscopeapp]

Approvability

Verdict: Approved at 82212f6

Macroscope's review found this PR approvable — This one-file mobile fix only adds explicit Android icon names to an existing markdown copy button, preserving iOS symbols and copy behavior. Its scope is small and self-contained, with no default, schema, infrastructure, or static-analysis changes.

^{You can add or adjust custom eligibility rules. Learn more.}

[coderabbitai]

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📒 Files selected for processing (1)

• apps/mobile/modules/t3-markdown-text/src/CopyTextButton.tsx

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📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

Walkthrough

CopyTextButton now supplies platform-specific symbol names to SymbolView for its copied and uncopied states. iOS retains its existing names, while Android receives Android-specific names.

Changes

Copy button icons

Layer / File(s)	Summary
Platform-specific symbol names apps/mobile/modules/t3-markdown-text/src/CopyTextButton.tsx	SymbolView receives checkmark and doc.on.doc on iOS, and check and content_copy on Android.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Low

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Merge Risk: ⚪ Minimal · up to 82212

The copy control uses supported platform-specific icons, and no issue blocking the documented behavior is established. The change is mergeable.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary change: fixing the Android code block copy icon.
Description check	✅ Passed	The description includes complete Problem, Change, Scope and approval, and Verification sections. It explains the cause, implementation, linked issue, device verification, screenshots, static checks, …
Linked Issues check	✅ Passed	Issue #13376 requires a visible copy icon in Android fenced-code-block headers. The changed apps/mobile/modules/t3-markdown-text/src/CopyTextButton.tsx now passes android: "content_copy" for the c…
Out of Scope Changes check	✅ Passed	The whole pull request changes only the Markdown module's CopyTextButton. The change supplies the platform-specific names needed for the issue behavior and preserves existing copy logic and iOS beha…
Approvability	✅ Passed	The pull request changes only apps/mobile/modules/t3-markdown-text/src/CopyTextButton.tsx. It supplies Android symbol names while preserving the existing iOS names. The diff does not change product …

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