Implement case-sensitive glob search toggle with Ctrl+I shortcut

[Copilot]

Adds the ability to toggle between case-sensitive and case-insensitive glob search using the Ctrl+I key combination, following the same convention as popular pager programs like less and more.

Problem

Users frequently need to search for paths that differ only in case, such as distinguishing between Rust's target directory and LLVM's Target directory. The existing glob search was always case-insensitive, making it impossible to filter results precisely.

Solution

• Toggle functionality: Press Ctrl+I in the glob search pane to switch between case-sensitive and case-insensitive matching
• Visual feedback: The pane title dynamically shows (case-sensitive) or (case-insensitive) to indicate the current mode
• Inline help: Updated the search pane help text to show case = ^I alongside existing shortcuts
• Non-interfering shortcut: Uses Ctrl+I instead of just I to avoid interference with typing 'I' in glob patterns
• Backward compatibility: Default behavior remains case-insensitive to preserve existing user workflows

Example Usage

1. Press / to open glob search
2. Enter pattern like **/target (you can now type 'I' normally in patterns)
3. Press Ctrl+I to toggle case sensitivity (notice title change)
4. Press Enter to search with the selected case mode

In case-insensitive mode (default), **/target matches target, Target, and TARGET.
In case-sensitive mode, **/target only matches target.

Implementation Details

• Added case_sensitive: bool field to GlobPane struct
• Modified glob_search() function to accept case sensitivity parameter and use appropriate gix_glob::pattern::Case mode
• Updated help documentation to reflect the new functionality
• Added comprehensive test coverage for both case modes and shortcut behavior
• Fixed shortcut interference by using Ctrl+I instead of just I

The implementation uses minimal, surgical changes to preserve existing behavior while adding the requested functionality.

Fixes #292

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[nyurik]

LOL. So nice to be able to type anything except the capital letter I ... :D

[Byron]

@copilot Make it so that the shortcut doesn't interfere with what the user would type into the glob prompt.

[Copilot]

@copilot Make it so that the shortcut doesn't interfere with what the user would type into the glob prompt.

Fixed in commit e46cb1b. Changed the shortcut from 'I' to Ctrl+I (^I) so users can now type 'I' normally in their glob patterns. The help text has been updated to show "case = ^I" and comprehensive tests have been added to verify both the typing behavior and the case toggle functionality work correctly.