Show skill tool calls as "Reading <name> skill"

[rafaeelaudibert]

Summary

• The current display for Skill tool calls dumps the raw input as JSON, e.g. Skill {"skill":"implementing-mcp-tools"}.
• This change renders it as Reading <skill-name> skill with the skill name in the accent color, matching how we already style input previews.

Test plan

• Trigger a session that invokes a skill (e.g. ask the agent to use the implementing-mcp-tools skill) and confirm the tool row reads Reading implementing-mcp-tools skill with the skill name highlighted.
• Confirm non-Skill tool calls (Read, Bash, Grep, MCP tools, etc.) are unchanged.
• Confirm the row is still expandable and the expanded view still shows the full raw input.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "Show skill tool calls as "Reading `<name..." | Re-trigger Greptile}