fix: render MODE highlight when instant query selected

[pratik50]

Small fix in the promql dataset and step-mode box -

• The MODE row wasn't highlighting when instant query was selected because its style was tied to !instant.
• Added a separate modeLabel style that shows up when instant is active. nothing major.

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Fixed PromQL controls sidebar styling to properly display active state for STEP and MODE controls when the step field is focused in instant query mode.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 98b7e2dc-417c-46c1-abcf-3b54b40e77ca

📥 Commits

Reviewing files that changed from the base of the PR and between 88c1801 and d47c56b.

📒 Files selected for processing (1)

• pkg/model/promql.go

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📝 Walkthrough

Walkthrough

This PR updates the PromQL controls sidebar rendering in pkg/model/promql.go to preserve active styling for the STEP and MODE rows when the step field is focused during instant mode, removing a prior condition that disabled active state selection.

Changes

PromQL Controls Sidebar Styling

Layer / File(s)	Summary
Instant mode step focus sidebar active state pkg/model/promql.go	The sidebar row prefix logic is changed from stepHi && !instant to stepHi, allowing STEP and MODE rows to remain marked as active when the step input has focus in instant mode. A modeLabel variable controls MODE row styling when both stepHi and instant are true.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A step in the spotlight, now instant and bright, 🌟
The sidebar rows dance, no longer held tight,
When focused and ready, both STEP and MODE glow,
The rabbit hops forward with style, row by row! 🐰

🚥 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%.	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 accurately describes the main change: fixing MODE row highlighting in instant query mode, which is the core focus of the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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