fix: restore add split button in advanced custom routes

[seefs001]

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• Closes “高级自定义”渠道配置路由内的”添加分流“按钮不见了 #7286

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Summary by CodeRabbit

• Accessibility

  • Improved screen-reader handling for the “Add split” button icon.

• UI Improvements

  • Moved the “Add split” control and explanatory text into the route group body for clearer layout and interaction.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: f67a2470-d2b2-4d60-b286-cc7a734c71f9

📥 Commits

Reviewing files that changed from the base of the PR and between 064ed94 and 78c1fb2.

📒 Files selected for processing (1)

• web/src/features/channels/components/dialogs/advanced-custom-editor-dialog.tsx

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

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Walkthrough

The route group editor now renders the explanatory text and “Add split” button in the group body. The header conditional closes before the body, and the Plus icon is marked as decorative.

Changes

Route group editor

Layer / File(s)	Summary
Move split controls into the group body web/src/features/channels/components/dialogs/advanced-custom-editor-dialog.tsx	The explanatory text and “Add split” button now render below the optional header. The body receives a top border when the header is shown. The Plus icon has aria-hidden="true".

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 78c1f

Advanced Custom route configuration again displays the Add split control, allowing users to add route splits as intended. No current merge-blocking risk is identified.

Suggested reviewers: calcium-ion

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes restoring the missing Add Split button in Advanced Custom routes.
Linked Issues check	✅ Passed	The change restores the Add Split button for Advanced Custom route configuration, which directly satisfies issue #7286.
Out of Scope Changes check	✅ Passed	The changes are limited to the affected route editor UI. Moving the button and explanatory text into the group body, plus marking the decorative icon as hidden, supports the stated fix.

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

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_{A rabbit hops where split paths grow
The button returns below the row
The header rests, the body shines
A hidden plus keeps markup fine
Soft paws applaud the cleaner flow}

_{Comment @coderabbitai help to get the list of available commands.}