Add more and add_large icons, replace remaining Material icon

[erskingardner]

Summary

• Add add_large.svg and more.svg icons to the SVG icon system
• Update existing icons: clean, help_filled, paste, zap
• Register new icons in the WnIcons enum
• Replace the last remaining Material icon (Icons.more_horiz) with WnIcon.more in the chat header

Test plan

• Verify new add_large and more icons render correctly
• Verify updated icons display properly throughout the app
• Confirm chat header menu button displays the new more icon

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Introduced two new custom icons for use across the application.

• Style

  • Updated the chat header menu icon to utilize the custom icon library for improved visual consistency.

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[coderabbitai]

Walkthrough

The changes introduce two new icon options (addLarge and more) to the custom WnIcons enum and update the chat header to use the new more icon instead of the standard Material Design icon.

Changes

Cohort / File(s)	Summary
Icon Enum Expansion lib/widgets/wn_icon.dart	Added two new enum values: addLarge('add_large') and more('more') to the WnIcons enum, expanding available custom icons.
Chat Header Icon Update lib/widgets/wn_chat_header.dart	Replaced the standard Icon(Icons.more_horiz) with a custom WnIcon using the newly added WnIcons.more. Removed the associated TODO comment.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title directly reflects the main changes: adding new icons (more and add_large) and replacing a Material icon with a custom one in the chat header.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[github-actions]

➡️ Coverage: 99.6% → 99.6% (0.00%)

[josefinalliende]

✅ LGTM