feat(tui): improve editor Ctrl/Alt word and line deletion shortcuts

- Add Ctrl+W for word deletion (stops at whitespace/punctuation)
- Add Ctrl+U for delete to start of line (merges with previous line at col 0)
- Change Ctrl+K from delete entire line to delete to end of line (merges with next line at EOL)
- Add Option+Backspace support in Ghostty (maps to Ctrl+W via ESC+DEL sequence)
- Cmd+Backspace in Ghostty works as Ctrl+U (terminal sends same control code)
- Update README and CHANGELOG with new keyboard shortcuts

Fixes #2, Fixes #3

packages/ai/src/models.generated.ts

@@ -1898,9 +1898,9 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text", "image"],
 			cost: {
-				input: 1.5,
-				output: 6,
-				cacheRead: 0.375,
+				input: 0.25,
+				output: 2,
+				cacheRead: 0.024999999999999998,
 				cacheWrite: 0,
 			},
 			contextWindow: 400000,
@@ -2289,13 +2289,13 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text"],
 			cost: {
-				input: 0.6,
-				output: 2.2,
+				input: 0.44999999999999996,
+				output: 1.9,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
-			contextWindow: 204800,
-			maxTokens: 131072,
+			contextWindow: 202752,
+			maxTokens: 4096,
 		} satisfies Model<"openai-completions">,
 		"anthropic/claude-sonnet-4.5": {
 			id: "anthropic/claude-sonnet-4.5",