Fixes two bugs in the input formatter:
1. Single/double quote regex now requires word boundaries:
- Contractions like it's, don't, won't no longer trigger highlighting
- Only properly quoted text like 'special' or "hello" gets cyan
- Mixed input like "it's a 'test' case" only highlights 'test'
2. Visual line calculation fix for exact terminal width:
- When text exactly fills terminal width, cursor wraps to next line
- Added +1 adjustment to account for this edge case
- Extracted calculate_visual_lines() for testability
Added 9 new tests covering all edge cases.
Fixes three bugs in the input formatter introduced in 4e16942:
1. Bug 2 & 3 (missing newline, line duplication):
- Changed print! to println! to add trailing newline
- Calculate visual lines based on terminal width instead of
logical line count, fixing duplication for wrapped lines
2. Bug 1 (^M on non-interactive prompts):
- Added TTY check to skip formatting when stdout is not a terminal
- Prevents terminal state corruption for stdin prompts
When users type prompts in interactive mode, the input is now
reformatted in place with enhanced highlighting:
- ALL CAPS words (2+ chars) become bold green (e.g., FIX, BUG, HTTP2)
- Quoted text ("..." or ...) becomes cyan
- Standard markdown formatting is also supported
New module: input_formatter.rs with 10 unit tests
Integrated into interactive.rs for both single-line and multiline input
