Add field tracking tests for text input components

[jserv]

This adds new tests to prevent regression of focus/registration bugs in text input components:

Registration tests:

• test_search_bar_registers: verify search bar registers buffer
• test_textfield_with_selection_registers: verify selection variant
• test_search_view_registers: verify search modal registers query

Focus persistence tests:

• test_search_bar_focus_persists: focus maintained across frames
• test_unregistered_field_loses_focus: negative test for tracking
• test_focus_switch_between_fields: multi-field focus transfer

State transition tests:

• test_disabled_field_clears_focus: disabled clears focus
• test_read_only_field_clears_focus: read_only clears focus
• test_slider_unrendered_clears_active: slider state cleanup
• test_rerender_after_skip_frame: conditional rendering behavior

Stress test:

• test_many_textfields_stress: 32 fields to test hash collisions

---

Summary by cubic

Add tests for text input field tracking to prevent focus/registration regressions and verify state cleanup across frames. Expands coverage for search bar, textfield variants, search view, and slider active state.

• Coverage
  • Registration: search bar, textfield with selection, search view query.
  • Focus: persistence across frames, unregistered cleared, switch between fields.
  • State changes: disabled/read-only clear focus, unrendered slider clears active, rerender after skip regains focus.
  • Stress: 32 textfields to exercise hash-collision handling.

^{Written for commit 44af8fe. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 1 file

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="tests/test-tracking.c">

<violation number="1" location="tests/test-tracking.c:507">
P2: The new focus-switching test bypasses the real focus logic by writing directly to ctx->focused_edit, so it cannot detect regressions in the behavior it claims to cover.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}