refactor(shared): consolidate plugin entry migration and detection utilities

src/hooks/legacy-plugin-toast/auto-migrate.ts

@@ -3,7 +3,8 @@ import { join } from "node:path"
 
 import { parseJsoncSafe } from "../../shared/jsonc-parser"
 import { getOpenCodeConfigPaths } from "../../shared/opencode-config-dir"
-import { LEGACY_PLUGIN_NAME, PLUGIN_NAME } from "../../shared/plugin-identity"
+import { PLUGIN_NAME } from "../../shared/plugin-identity"
+import { isCanonicalEntry, isLegacyEntry, toCanonicalEntry } from "../../shared/plugin-entry-migrator"
 import { migrateLegacyPluginEntry } from "./plugin-entry-migrator"
 
 export interface MigrationResult {
@@ -17,22 +18,6 @@ interface OpenCodeConfig {
   plugin?: string[]
 }
 
-function isLegacyEntry(entry: string): boolean {
-  return entry === LEGACY_PLUGIN_NAME || entry.startsWith(`${LEGACY_PLUGIN_NAME}@`)
-}
-
-function isCanonicalEntry(entry: string): boolean {
-  return entry === PLUGIN_NAME || entry.startsWith(`${PLUGIN_NAME}@`)
-}
-
-function toLegacyCanonical(entry: string): string {
-  if (entry === LEGACY_PLUGIN_NAME) return PLUGIN_NAME
-  if (entry.startsWith(`${LEGACY_PLUGIN_NAME}@`)) {
-    return `${PLUGIN_NAME}${entry.slice(LEGACY_PLUGIN_NAME.length)}`
-  }
-  return entry
-}
-
 function detectOpenCodeConfigPath(overrideConfigDir?: string): string | null {
   if (overrideConfigDir) {
     const jsoncPath = join(overrideConfigDir, "opencode.jsonc")
@@ -63,7 +48,7 @@ export function autoMigrateLegacyPluginEntry(overrideConfigDir?: string): Migrat
 
     const hasCanonical = plugins.some(isCanonicalEntry)
     const from = legacyEntries[0]
-    const to = toLegacyCanonical(from)
+    const to = toCanonicalEntry(from)
     const migrated = migrateLegacyPluginEntry(configPath)
     if (!migrated) return { migrated: false, from: null, to: null, configPath }