Merge syntax-highlighting branch: add syntax highlighting and intra-line diff

- Syntax highlighting for markdown code blocks, read/write tool output
- Intra-line diff highlighting for edit tool with word-level inverse
- VS Code-style syntax colors in themes
- Fix Google provider FinishReason handling
- Upgrade @google/genai to 1.34.0

package-lock.json

@@ -2583,6 +2583,12 @@
 				"url": "https://github.com/chalk/ansi-styles?sponsor=1"
 			}
 		},
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+			"license": "MIT"
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 			"resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
@@ -2806,6 +2812,169 @@
 				"url": "https://polar.sh/cva"
 			}
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+			},
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+			"license": "MIT",
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+			"license": "MIT",
+			"dependencies": {
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+			},
+			"engines": {
+				"node": ">=8"
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+		"node_modules/cli-highlight/node_modules/wrap-ansi": {
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+			"resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
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+			"license": "MIT",
+			"dependencies": {
+				"ansi-styles": "^4.0.0",
+				"string-width": "^4.1.0",
+				"strip-ansi": "^6.0.0"
+			},
+			"engines": {
+				"node": ">=10"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+			}
+		},
+		"node_modules/cli-highlight/node_modules/yargs": {
+			"version": "16.2.0",
+			"resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
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+			"license": "MIT",
+			"dependencies": {
+				"cliui": "^7.0.2",
+				"escalade": "^3.1.1",
+				"get-caller-file": "^2.0.5",
+				"require-directory": "^2.1.1",
+				"string-width": "^4.2.0",
+				"y18n": "^5.0.5",
+				"yargs-parser": "^20.2.2"
+			},
+			"engines": {
+				"node": ">=10"
+			}
+		},
+		"node_modules/cli-highlight/node_modules/yargs-parser": {
+			"version": "20.2.9",
+			"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.9.tgz",
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+			"license": "ISC",
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 		"node_modules/cliui": {
 			"version": "8.0.1",
 			"resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
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@@ -4551,6 +4718,17 @@
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 			"license": "MIT"
 		},
+		"node_modules/mz": {
+			"version": "2.7.0",
+			"resolved": "https://registry.npmjs.org/mz/-/mz-2.7.0.tgz",
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+			"license": "MIT",
+			"dependencies": {
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+				"object-assign": "^4.0.1",
+				"thenify-all": "^1.0.0"
+			}
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 		"node_modules/nanoid": {
 			"version": "3.3.11",
 			"resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",
@@ -4634,6 +4812,15 @@
 				"url": "https://opencollective.com/node-fetch"
 			}
 		},
+		"node_modules/object-assign": {
+			"version": "4.1.1",
+			"resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
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+			"license": "MIT",
+			"engines": {
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 		"node_modules/ollama": {
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@@ -4742,6 +4929,27 @@
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 			"license": "(MIT AND Zlib)"
 		},
+		"node_modules/parse5": {
+			"version": "5.1.1",
+			"resolved": "https://registry.npmjs.org/parse5/-/parse5-5.1.1.tgz",
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+			"license": "MIT"
+		},
+		"node_modules/parse5-htmlparser2-tree-adapter": {
+			"version": "6.0.1",
+			"resolved": "https://registry.npmjs.org/parse5-htmlparser2-tree-adapter/-/parse5-htmlparser2-tree-adapter-6.0.1.tgz",
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+			"license": "MIT",
+			"dependencies": {
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+			}
+		},
+		"node_modules/parse5-htmlparser2-tree-adapter/node_modules/parse5": {
+			"version": "6.0.1",
+			"resolved": "https://registry.npmjs.org/parse5/-/parse5-6.0.1.tgz",
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+			"license": "MIT"
+		},
 		"node_modules/partial-json": {
 			"version": "0.1.7",
 			"resolved": "https://registry.npmjs.org/partial-json/-/partial-json-0.1.7.tgz",
@@ -4937,7 +5145,6 @@
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@@ -5502,6 +5709,27 @@
 				"node": ">=6"
 			}
 		},
+		"node_modules/thenify": {
+			"version": "3.3.1",
+			"resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
+			"integrity": "sha512-RVZSIV5IG10Hk3enotrhvz0T9em6cyHBLkH/YAZuKqd8hRkKhSfCGIcP2KUY0EPxndzANBmNllzWPwak+bheSw==",
+			"license": "MIT",
+			"dependencies": {
+				"any-promise": "^1.0.0"
+			}
+		},
+		"node_modules/thenify-all": {
+			"version": "1.6.0",
+			"resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
+			"integrity": "sha512-RNxQH/qI8/t3thXJDwcstUO4zeqo64+Uy/+sNVRBx4Xn2OX+OZ9oP+iJnNFqplFra2ZUVeKCSa2oVWi3T4uVmA==",
+			"license": "MIT",
+			"dependencies": {
+				"thenify": ">= 3.1.0 < 4"
+			},
+			"engines": {
+				"node": ">=0.8"
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 		"node_modules/tinybench": {
 			"version": "2.9.0",
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@@ -6065,7 +6293,6 @@
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-			"dev": true,
 			"license": "ISC",
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@@ -6242,6 +6469,7 @@
 				"@mariozechner/pi-ai": "^0.23.3",
 				"@mariozechner/pi-tui": "^0.23.3",
 				"chalk": "^5.5.0",
+				"cli-highlight": "^2.1.11",
 				"diff": "^8.0.2",
 				"file-type": "^21.1.1",
 				"glob": "^11.0.3",