feat: add conflict resolution, linter validation, and SEARCH/REPLACE system

- Add git-style conflict resolution with visual diff highlighting
- Add buffer-local keymaps: co/ct/cb/cn for conflict resolution
- Add floating menu with auto-show after code injection
- Add linter validation that auto-checks LSP diagnostics after accepting code
- Add SEARCH/REPLACE block parsing with fuzzy matching
- Add new commands: CoderConflictMenu, CoderLintCheck, CoderLintFix
- Update README with complete keymaps reference and issue reporting guide
- Update CHANGELOG and llms.txt with full documentation
- Clean up code comments and documentation

Co-Authored-By: Claude <noreply@anthropic.com>

lua/codetyper/cost.lua

@@ -100,7 +100,7 @@ M.pricing = {
 	["gpt-image-1"] = { input = 5.00, cached_input = 1.25, output = nil },
 	["gpt-image-1-mini"] = { input = 2.00, cached_input = 0.20, output = nil },
 
-	-- Claude models (Anthropic)
+	-- Claude models
 	["claude-3-opus"] = { input = 15.00, cached_input = 7.50, output = 75.00 },
 	["claude-3-sonnet"] = { input = 3.00, cached_input = 1.50, output = 15.00 },
 	["claude-3-haiku"] = { input = 0.25, cached_input = 0.125, output = 1.25 },