refactor: consolidate prompt functionality into support-prompt module

- Move code action prompts from core/prompts to shared/support-prompt
- Migrate enhance prompt functionality from modes to support-prompt
- Add UI for managing code action prompts in PromptsView
- Update types and interfaces for better prompt management

src/shared/__tests__/support-prompts.test.ts

@@ -0,0 +1,138 @@
+import { codeActionPrompt, type CodeActionType } from "../support-prompt"
+
+describe("Code Action Prompts", () => {
+	const testFilePath = "test/file.ts"
+	const testCode = "function test() { return true; }"
+
+	describe("EXPLAIN action", () => {
+		it("should format explain prompt correctly", () => {
+			const prompt = codeActionPrompt.create("EXPLAIN", {
+				filePath: testFilePath,
+				selectedText: testCode,
+			})
+
+			expect(prompt).toContain(`@/${testFilePath}`)
+			expect(prompt).toContain(testCode)
+			expect(prompt).toContain("purpose and functionality")
+			expect(prompt).toContain("Key components")
+			expect(prompt).toContain("Important patterns")
+		})
+	})
+
+	describe("FIX action", () => {
+		it("should format fix prompt without diagnostics", () => {
+			const prompt = codeActionPrompt.create("FIX", {
+				filePath: testFilePath,
+				selectedText: testCode,
+			})
+
+			expect(prompt).toContain(`@/${testFilePath}`)
+			expect(prompt).toContain(testCode)
+			expect(prompt).toContain("Address all detected problems")
+			expect(prompt).not.toContain("Current problems detected")
+		})
+
+		it("should format fix prompt with diagnostics", () => {
+			const diagnostics = [
+				{
+					source: "eslint",
+					message: "Missing semicolon",
+					code: "semi",
+				},
+				{
+					message: "Unused variable",
+					severity: 1,
+				},
+			]
+
+			const prompt = codeActionPrompt.create("FIX", {
+				filePath: testFilePath,
+				selectedText: testCode,
+				diagnostics,
+			})
+
+			expect(prompt).toContain("Current problems detected:")
+			expect(prompt).toContain("[eslint] Missing semicolon (semi)")
+			expect(prompt).toContain("[Error] Unused variable")
+			expect(prompt).toContain(testCode)
+		})
+	})
+
+	describe("IMPROVE action", () => {
+		it("should format improve prompt correctly", () => {
+			const prompt = codeActionPrompt.create("IMPROVE", {
+				filePath: testFilePath,
+				selectedText: testCode,
+			})
+
+			expect(prompt).toContain(`@/${testFilePath}`)
+			expect(prompt).toContain(testCode)
+			expect(prompt).toContain("Code readability")
+			expect(prompt).toContain("Performance optimization")
+			expect(prompt).toContain("Best practices")
+			expect(prompt).toContain("Error handling")
+		})
+	})
+
+	describe("get template", () => {
+		it("should return default template when no custom prompts provided", () => {
+			const template = codeActionPrompt.get(undefined, "EXPLAIN")
+			expect(template).toBe(codeActionPrompt.default.EXPLAIN)
+		})
+
+		it("should return custom template when provided", () => {
+			const customTemplate = "Custom template for explaining code"
+			const customPrompts = {
+				EXPLAIN: customTemplate,
+			}
+			const template = codeActionPrompt.get(customPrompts, "EXPLAIN")
+			expect(template).toBe(customTemplate)
+		})
+
+		it("should return default template when custom prompts does not include type", () => {
+			const customPrompts = {
+				SOMETHING_ELSE: "Other template",
+			}
+			const template = codeActionPrompt.get(customPrompts, "EXPLAIN")
+			expect(template).toBe(codeActionPrompt.default.EXPLAIN)
+		})
+	})
+
+	describe("create with custom prompts", () => {
+		it("should use custom template when provided", () => {
+			const customTemplate = "Custom template for ${filePath}"
+			const customPrompts = {
+				EXPLAIN: customTemplate,
+			}
+
+			const prompt = codeActionPrompt.create(
+				"EXPLAIN",
+				{
+					filePath: testFilePath,
+					selectedText: testCode,
+				},
+				customPrompts,
+			)
+
+			expect(prompt).toContain(`Custom template for ${testFilePath}`)
+			expect(prompt).not.toContain("purpose and functionality")
+		})
+
+		it("should use default template when custom prompts does not include type", () => {
+			const customPrompts = {
+				EXPLAIN: "Other template",
+			}
+
+			const prompt = codeActionPrompt.create(
+				"EXPLAIN",
+				{
+					filePath: testFilePath,
+					selectedText: testCode,
+				},
+				customPrompts,
+			)
+
+			expect(prompt).toContain("Other template")
+		})
+	})
+})