feat(ui): add session content search with wildcard support

[alexhayes-block]

Overview

This PR adds a search feature to the "Previous goose sessions" screen, allowing users to search both session metadata and content with wildcard pattern matching.

Features

• Add visible search input at the top of the sessions list
• Implement content search across session messages
• Support wildcard matching using the * character (e.g., gr*en matches green)
• Show visual indicators for content matches
• Add progress tracking for content search operations
• Maintain compatibility with existing keyboard shortcut search (Ctrl+F/Cmd+F)

Screenshots

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Video Demo

https://github.com/user-attachments/assets/77ecb66a-751a-4faf-b173-113ecf7619ed

Implementation Details

• Added a new utility for wildcard pattern matching
• Enhanced the session list view with a permanent search input
• Implemented content searching with progress tracking
• Fixed issues with wildcard matching to properly handle patterns
• Added visual indicators to distinguish content matches from metadata matches

Testing

• Tested various search patterns with and without wildcards
• Verified content search functionality across multiple sessions
• Ensured proper handling of edge cases (empty search, long content, etc.)
• Confirmed that content match labels are properly cleared when search is reset