fix(spinner): remove .js extensions from dynamic requires

Changed require('./logger.js') to require('./logger') and
require('./debug.js') to require('./debug') to fix test failures.

The .js extensions work in compiled output but fail when vitest
runs TypeScript source directly. Node.js module resolution
automatically adds the correct extension (.ts in source, .js
in compiled output) when no extension is specified.

This fixes CI test failures where tests couldn't find modules:
- Error: Cannot find module './logger.js'

Fixes test failures in #14

Author: jdalton

src/spinner.ts

@@ -669,7 +669,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
           getDefaultLogger,
           incLogCallCountSymbol,
           lastWasBlankSymbol,
-        } = /*@__PURE__*/ require('./logger.js')
+        } = /*@__PURE__*/ require('./logger')
         const logger = getDefaultLogger()
         if (methodName === 'stop') {
           if (wasSpinning && normalized) {
@@ -748,7 +748,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
         const {
           LOG_SYMBOLS,
           getDefaultLogger,
-        } = /*@__PURE__*/ require('./logger.js')
+        } = /*@__PURE__*/ require('./logger')
         // Note: Status messages always go to stderr.
         const logger = getDefaultLogger()
         logger.error(`${LOG_SYMBOLS[symbolType]} ${text}`, ...extras)
@@ -775,7 +775,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
        * @returns This spinner for chaining
        */
       debug(text?: string | undefined, ...extras: unknown[]) {
-        const { isDebug } = /*@__PURE__*/ require('./debug.js')
+        const { isDebug } = /*@__PURE__*/ require('./debug')
         if (isDebug()) {
           return this.#showStatusAndKeepSpinning('info', [text, ...extras])
         }
@@ -792,7 +792,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
        * @returns This spinner for chaining
        */
       debugAndStop(text?: string | undefined, ...extras: unknown[]) {
-        const { isDebug } = /*@__PURE__*/ require('./debug.js')
+        const { isDebug } = /*@__PURE__*/ require('./debug')
         if (isDebug()) {
           return this.#apply('info', [text, ...extras])
         }
@@ -939,7 +939,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
        * @returns This spinner for chaining
        */
       log(...args: unknown[]) {
-        const { getDefaultLogger } = /*@__PURE__*/ require('./logger.js')
+        const { getDefaultLogger } = /*@__PURE__*/ require('./logger')
         const logger = getDefaultLogger()
         logger.log(...args)
         return this
@@ -1068,7 +1068,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
        * ```
        */
       step(text?: string | undefined, ...extras: unknown[]) {
-        const { getDefaultLogger } = /*@__PURE__*/ require('./logger.js')
+        const { getDefaultLogger } = /*@__PURE__*/ require('./logger')
         if (typeof text === 'string') {
           const logger = getDefaultLogger()
           // Add blank line before step for visual separation.
@@ -1098,7 +1098,7 @@ export function Spinner(options?: SpinnerOptions | undefined): Spinner {
       substep(text?: string | undefined, ...extras: unknown[]) {
         if (typeof text === 'string') {
           // Add 2-space indent for substep.
-          const { getDefaultLogger } = /*@__PURE__*/ require('./logger.js')
+          const { getDefaultLogger } = /*@__PURE__*/ require('./logger')
           const logger = getDefaultLogger()
           // Use error (stderr) to align with logger.substep() default stream.
           logger.error(`  ${text}`, ...extras)