refactor(rsc): use relative IDs in environment imports manifest

Use toRelativeId() for manifest keys instead of absolute paths.
This ensures stable builds across different machines/environments.

Before: "/home/user/.../entry.ssr.tsx"
After:  "src/framework/entry.ssr.tsx"

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: hi-ogawa

packages/plugin-rsc/src/plugin.ts

@@ -184,7 +184,9 @@ class RscPluginManager {
         const relativePath = normalizeRelativePath(
           path.relative(sourceOutDir, path.join(targetOutDir, meta.fileName)),
         )
-        code += `  ${JSON.stringify(resolvedId)}: () => import(${JSON.stringify(relativePath)}),\n`
+        // Use relative ID for stable builds across different machines
+        const relativeId = this.toRelativeId(resolvedId)
+        code += `  ${JSON.stringify(relativeId)}: () => import(${JSON.stringify(relativePath)}),\n`
       }
       code += '}\n'
 

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

@@ -124,9 +124,8 @@ export function vitePluginImportEnvironment(
               resolvedId = resolved.id
             }
 
-            // Track discovered entry
+            // Track discovered entry (keyed by absolute path for generateBundle lookup)
             manager.environmentImportMetaMap[resolvedId] = {
-              // TODO: relative-ize resolveId
               resolvedId,
               targetEnv: environmentName,
               sourceEnv: this.environment.name,
@@ -140,7 +139,9 @@ export function vitePluginImportEnvironment(
               // Build: emit manifest lookup with static import
               // The manifest is generated in buildApp after all builds complete
               // Use placeholder that renderChunk will replace with correct relative path
-              replacement = `(await import(${JSON.stringify(ENV_IMPORTS_MANIFEST_PLACEHOLDER)})).default[${JSON.stringify(resolvedId)}]()`
+              // Use relative ID for stable builds across different machines
+              const relativeId = manager.toRelativeId(resolvedId)
+              replacement = `(await import(${JSON.stringify(ENV_IMPORTS_MANIFEST_PLACEHOLDER)})).default[${JSON.stringify(relativeId)}]()`
             }
 
             const [start, end] = match.indices![0]!