fix(tui): omit redundant CLI-only menu dividers

[aidandaly24]

Description

Fix the duplicate horizontal dividers below the command filter in CLI-only menus, including project log/traces, Harness and Runtime traces, and payment menus.

The filter already has a divider. When all visible commands belonged to the CLI-only group, the menu also emitted an untitled section divider even though there was no preceding group to separate.

Omit that redundant section marker before computing the scroll window. This removes the extra line and its row cost while preserving mixed-group separators, titled section headers, command ordering, and navigation. No shared divider or scrolling API changes.

Screenshots

Before and after, captured from the real CLI through the TUI harness at 100 columns by 16 rows:

Menu	Before	After
Log
Payments

Related Issue

Not applicable. No issue created for this small UX fix.

Documentation PR

Not applicable. No commands or configuration changed.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

• I ran bun test
• I ran the relevant end-to-end tests with bun run test:e2e, or explained why they are not applicable
• I ran bun run typecheck
• I ran bun run lint:check
• I ran bun run format:check
• I ran bun run build
• If I modified src/assets/, I updated affected snapshots with bun test <test-file> --update-snapshots and committed them

bun test: 3,961 passed, 0 failed. Focused menu/navigation/scrolling tests: 159 passed, 0 failed. Typecheck, lint, formatting, and build passed.

The 11 new regression cases failed before the fix and passed afterward. They cover affected menus, filtering away and restoring the preceding group, and an 8-row terminal where the redundant divider previously hid the second option. Existing mixed-menu separators, titled headers, and all CLI-only help/navigation flows remain covered.

Real-AWS end-to-end tests are not applicable: this only changes menu section presentation. Log and payment menus were exercised and visually checked through the TUI harness using an empty, undeployed project.

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

---

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[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)

[agentcore-devx-automation]

AgentCore Harness Review

Verdict: Looks good

The change is small and correct: when every filtered option belongs to CLI_ONLY_SECTION, CommandMenuBody maps each option's section to undefined, which scrollWindow.startsSection treats as "no divider". This cleanly handles both the always-all-CLI menus (e.g. /agentcore/log, /agentcore/payment/*) and the transient case where filtering narrows the visible options down to only CLI-only entries — verified by the new tests.

A few things I checked and am satisfied with:

• useMemo dependency array is right ([filtered]).
• Empty filtered still produces sections = [], so scrollWindow returns no rows — no divider regressions.
• CLI_ONLY_SECTION = "cli" is a sentinel used both for classification and as the divider's suppressed title; no router declares a real section titled "cli" today, and if one ever did the collision predates this change.
• Tests exercise real command routes and assert on rendered frames rather than mocking internals — consistent with the repo's testing guidance.
• Purely visual TUI polish, no new user-facing action worth telemetry.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.39%. Comparing base (238e54e) to head (af62c02).
⚠️ Report is 3 commits behind head on refactor.

Additional details and impacted files

@@            Coverage Diff            @@
##           refactor    #2493   +/-   ##
=========================================
  Coverage     97.39%   97.39%           
=========================================
  Files           642      642           
  Lines         46801    46804    +3     
=========================================
+ Hits          45584    45587    +3     
  Misses         1217     1217           

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