Add missing CRITICAL severity filter to Copy Issues panel

[Copilot]

The Copy Issues panel lacked a CRITICAL severity filter despite the backend supporting it. Critical comments were invisible and non-copyable through the UI.

Changes

• IssuesPanel.js: Added CRITICAL filter button and included 'critical' in default active filters (alongside error, warning)
• styles.css: Added styling for critical filter button (#dc2626 dark red, consistent with severity hierarchy)

Result

Critical comments now visible and selectable by default. Filter ordering: CRITICAL → ERROR → WARNING → INFO.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Missing Critical Comment in copy issues section.</issue_title>
<issue_description>it would be better to have crtical comment in copy issues (not for copying but also to show user there is 1 critical issues)

1. Details of the review

gk@jarvis:~/hex/fdt-templ$ cd "/home/gk/hex/fdt-templ" && "/usr/local/bin/lrc" review
Review submitted, ID: 751
Account: ganeshkumar6120@gmail.com
Title: Tranquil Wave
Review link: https://livereview.hexmos.com/#/reviews/751

🌐 Review available at: http://localhost:8000
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Enter commit message: 

2. comments missing in top

3. Only info comments are present in top comments

5. Critical comment got missed

</issue_description>

<agent_instructions>Check if "critical" is actually missing in the lrc webui (local review ui) and if so - include it.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Missing Critical Comment in copy issues section. #19

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[shrsv]

@copilot I am confused - so how many levels are expected from the LLM side (check the prompt). Support all the labels/levels supported by the LLM prompt/specification for reviews.

[Copilot]

Pull request overview

This PR adds the missing CRITICAL severity filter to the Copy Issues panel in the lrc (local review client) web UI. The backend has always supported critical severity comments, but the UI lacked a filter button to show them, making critical comments invisible and non-copyable through the panel.

Changes:

• Added CRITICAL filter button with count badge and toggle functionality
• Included 'critical' in default active filters (alongside 'error' and 'warning')
• Added CSS styling for critical filter button using dark red color (#dc2626)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cmd/lrc/static/components/IssuesPanel.js	Added critical filter button, criticalCount calculation, and included 'critical' in default active filters
cmd/lrc/static/styles.css	Added styling for critical filter button with appropriate color hierarchy