refactor(tui): standardize builtin plugin ids

packages/tui/src/feature-plugins/home/footer.tsx

@@ -99,7 +99,7 @@ function View(props: { context: Plugin.Context }) {
 }
 
 export default Plugin.define({
-  id: "opencode.home-footer",
+  id: "opencode.home.footer",
   setup(context) {
     // Root takeover: an external plugin replacing home.footer wins (last-
     // enabled) and this builtin shows as suppressed, not silently gone.

packages/tui/src/feature-plugins/prompt/footer.tsx

@@ -83,7 +83,7 @@ export function PromptFooter(props: { context: Plugin.Context; sessionID?: strin
 }
 
 export default Plugin.define({
-  id: "opencode.prompt-footer",
+  id: "opencode.prompt.footer",
   setup(context) {
     context.ui.slot({
       append: "prompt.footer",

packages/tui/src/feature-plugins/sidebar/context.tsx

@@ -42,7 +42,7 @@ export function SidebarContext(props: { context: Plugin.Context; sessionID: stri
 }
 
 export default Plugin.define({
-  id: "internal:sidebar-context",
+  id: "opencode.sidebar.context",
   setup(context) {
     context.ui.slot({
       append: "sidebar.content",

packages/tui/src/feature-plugins/sidebar/footer.tsx

@@ -40,7 +40,7 @@ function View(props: { context: Plugin.Context; sessionID: string }) {
 }
 
 export default Plugin.define({
-  id: "opencode.sidebar-footer",
+  id: "opencode.sidebar.footer",
   setup(context) {
     // Append keeps the path open to additive plugin claims; an external
     // replace still takes the boundary over.

packages/tui/src/feature-plugins/sidebar/mcp.tsx

@@ -71,7 +71,7 @@ function View(props: { context: Plugin.Context; sessionID: string }) {
 }
 
 export default Plugin.define({
-  id: "internal:sidebar-mcp",
+  id: "opencode.sidebar.mcp",
   setup(context) {
     context.ui.slot({
       append: "sidebar.content",

packages/tui/src/feature-plugins/system/diff-viewer.tsx

@@ -1079,7 +1079,7 @@ function Commands(props: { context: Plugin.Context }) {
 }
 
 export default Plugin.define({
-  id: "diff-viewer",
+  id: "opencode.diffs",
   setup(context) {
     context.ui.router.register({
       name: ROUTE,

packages/tui/test/cli/tui/diff-viewer.test.tsx

@@ -29,7 +29,7 @@ test("closing the diff viewer returns to the route it opened from", async () =>
   try {
     expect(viewer.current()).toEqual({
       type: "plugin",
-      id: "diff-viewer",
+      id: "opencode.diffs",
       name: "diff",
       data: { mode: "working", sessionID: "session-1", returnRoute: startRoute },
     })
@@ -207,7 +207,7 @@ async function renderDiffViewer(
             navigate(destination: Destination) {
               setCurrent(
                 destination.type === "plugin" && !("id" in destination)
-                  ? { ...destination, id: "diff-viewer" }
+                  ? { ...destination, id: "opencode.diffs" }
                   : destination,
               )
             },
@@ -334,7 +334,7 @@ test("branch diff source requests branch VCS diff", async () => {
   const viewer = await renderDiffViewer([], {
     initialRoute: {
       type: "plugin",
-      id: "diff-viewer",
+      id: "opencode.diffs",
       name: "diff",
       data: { mode: "branch", sessionID: "session-1", returnRoute: startRoute },
     },
@@ -342,7 +342,7 @@ test("branch diff source requests branch VCS diff", async () => {
   try {
     expect(viewer.current()).toEqual({
       type: "plugin",
-      id: "diff-viewer",
+      id: "opencode.diffs",
       name: "diff",
       data: { mode: "branch", sessionID: "session-1", returnRoute: startRoute },
     })