refactor(rsc): remove entryName from environment import metadata

Let Rollup auto-name emitted chunks instead of deriving entry names
from specifiers. The actual output filename is tracked via
generateBundle anyway, so the explicit name was unnecessary.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: hi-ogawa

packages/plugin-rsc/src/plugins/import-environment.ts

@@ -21,7 +21,6 @@ export type EnvironmentImportMeta = {
   targetEnv: string
   sourceEnv: string
   specifier: string
-  entryName: string
 }
 
 export function vitePluginImportEnvironment(
@@ -67,7 +66,6 @@ export function vitePluginImportEnvironment(
             this.emitFile({
               type: 'chunk',
               id: meta.resolvedId,
-              name: meta.entryName,
             })
           }
         }
@@ -125,18 +123,13 @@ export function vitePluginImportEnvironment(
               resolvedId = resolved.id
             }
 
-            // TODO: shouldn't be necessary. replace with internal ID.
-            // Derive entry name from specifier (e.g., './entry.ssr.tsx' -> 'entry.ssr')
-            const entryName = deriveEntryName(specifier)
-
             // Track discovered entry
             manager.environmentImportMetaMap[resolvedId] = {
               // TODO: relative-ize resolveId
               resolvedId,
               targetEnv: environmentName,
               sourceEnv: this.environment.name,
               specifier,
-              entryName,
             }
 
             let replacement: string
@@ -204,13 +197,3 @@ export function vitePluginImportEnvironment(
     ),
   ]
 }
-
-function deriveEntryName(specifier: string): string {
-  // Remove leading ./ or ../
-  let name = specifier.replace(/^\.\.?\//, '')
-  // Remove extension
-  name = name.replace(/\.[^.]+$/, '')
-  // Get basename if it's a path
-  name = path.basename(name)
-  return name
-}