refactor: reduce code duplication and improve error handling

[linw1995]

Summary

This PR focuses on reducing code duplication and improving error handling across multiple modules:

Changes

1. Anthropic client (crates/anthropic/src/client.rs)

• Introduced messages_builder! macro to eliminate duplication between MessagesBuilder and MessagesStreamBuilder
• Reduced ~120 lines of repetitive builder code
• Both builders now share a single implementation via macro

2. Code highlighting (crates/coco-highlight/src/lang.rs)

• Created simple_config() helper function to reduce duplication in language configuration
• Consolidated bash, diff, and JSON config creation into a single reusable function

3. Component macros (crates/coco-macro/src/lib.rs)

• Extracted parse_type_id() function with improved error handling
• Added proper span information for compile-time errors
• Better error messages when component attribute is missing or malformed
• Both ComponentExt and ContentComponentExt macros now share the same parsing logic

4. TUI widgets (crates/coco-tui/src/widgets/)

• Created new shared tabs module with reusable tab panel utilities
• Extracted tab_panel_width(), tab_panel_height(), and render_tabs_panel() functions
• Both bash and str_replace tools now use the shared tab rendering code

5. Session socket client (src/combo/session.rs)

• Introduced send_and_expect() helper method to reduce duplication in request-response patterns
• All metadata, MCP, prompt, and reply methods now use the same underlying implementation

Benefits

• Reduced code duplication: ~200+ lines of repetitive code eliminated
• Improved maintainability: Changes to builder/response patterns now only need to be made in one place
• Better error messages: Compile-time errors in macros now include proper span information
• Clearer code organization: Shared utilities are properly abstracted into reusable functions

[codecov-commenter]

Codecov Report

❌ Patch coverage is 31.57895% with 143 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.15%. Comparing base (a46f02c) to head (00bbe8f).
⚠️ Report is 9 commits behind head on dev.

Files with missing lines	Patch %	Lines
crates/anthropic/src/client.rs	0.00%	80 Missing ⚠️
crates/coco-tui/src/widgets/tabs.rs	0.00%	25 Missing ⚠️
crates/coco-macro/src/lib.rs	64.86%	13 Missing ⚠️
...ates/coco-tui/src/components/messages/tool/bash.rs	0.00%	10 Missing ⚠️
...co-tui/src/components/messages/tool/str_replace.rs	0.00%	9 Missing ⚠️
src/combo/session.rs	76.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #153      +/-   ##
==========================================
- Coverage   50.22%   47.15%   -3.08%     
==========================================
  Files          93       99       +6     
  Lines       25033    27274    +2241     
==========================================
+ Hits        12574    12860     +286     
- Misses      12459    14414    +1955     

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