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Syntax highlighting for tools (#68)

* Add diff and diff-mode requirements for str-replace overlay diffing

* Implement cached overlay-based str-replace diff transformation

Add comprehensive str-replace diff functionality:
- greger-ui--str-replace-diff-transform-fn: Font-lock function for tool_use blocks
- greger-ui--is-str-replace-tool-use-p: Detect str-replace tools
- greger-ui--apply-str-replace-diff-overlay: Create overlays with diff display
- greger-ui--extract-str-replace-param: Extract parameters from tool_use nodes
- greger-ui--generate-diff-content: Generate diffs using system diff command
- greger-ui--process-diff-output: Clean up diff headers and apply diff-mode syntax
- Caching mechanism to avoid re-computation on file reopen
- Overlay management and cleanup functions

This transforms str-replace original-content/new-content into visual diffs
while preserving the original data in the file for persistence.

* Add str-replace diff transformation to treesit font-lock rules

Add tool_use nodes to the folding feature so that str-replace blocks
get processed for diff overlay transformation.

* Add cleanup hook for str-replace overlays on buffer kill

* Create test file for str-replace diff functionality

* Improve diff generation to handle identical content gracefully

* Fix diff processing to use temporary buffer for diff-mode

Process diff content in a dedicated temporary buffer with diff-mode
to avoid interfering with the current buffer's mode.

* Add debug function for testing str-replace detection

* Add test function to generate and display str-replace diffs

* Refactor greger-parser--extract-tool-use to use separate params extraction function

- Extract parameter parsing logic into greger-parser--extract-tool-use-params
- Update both greger-parser--extract-tool-use and greger-parser--extract-server-tool-use to use the new function
- Simplifies code and improves reusability

* Refactor greger-parser--extract-tool-use-params to use helper ... (continued)

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