fix(vscode): report failed mention drops and GitHub comment batches

packages/kilo-vscode/tests/unit/comments-github.test.ts

@@ -142,4 +142,19 @@ describe("postAllGithub", () => {
     expect(result.posted.map((item) => item.id)).toEqual(["first"])
     expect(result.failure).toBe("boom")
   })
+
+  it("treats a rejected send as the first failure and keeps the unposted comments", async () => {
+    const sent: string[] = []
+    const result = await postAllGithub(
+      [comment("first", 2), comment("second", 1), comment("third", 1)],
+      fake((item) => {
+        sent.push(item.id)
+        if (item.id === "second") throw new Error("network down")
+        return { success: true }
+      }),
+    )
+    expect(sent).toEqual(["first", "second"])
+    expect(result.posted.map((item) => item.id)).toEqual(["first"])
+    expect(result.failure).toBe("network down")
+  })
 })

packages/kilo-vscode/tests/unit/use-file-mention.test.ts

@@ -2412,4 +2412,13 @@ describe("useFileMention reference drops", () => {
       expect(area.value).toBe("")
     })
   })
+
+  it("reports a drop as unhandled when the editor does not apply the insert", () => {
+    withMention("", undefined, (mention, area) => {
+      // execCommand can silently no-op; the textarea stays unchanged.
+      globalThis.document.execCommand = () => false
+      expect(mention.insertDrop({ kind: "terminal" }, area, () => {}, "")).toBe(false)
+      expect(area.value).toBe("")
+    })
+  })
 })

packages/kilo-vscode/webview-ui/diff-viewer/comments-github.ts

@@ -78,7 +78,9 @@ export function createCommentsGithub(opts: Options): CommentsGithub {
     })
   }
 
-  const send = (comment: ReviewComment) => {
+  // async so a synchronous throw while building the request becomes a rejection
+  // that postAllGithub can report instead of escaping the per-comment loop.
+  const send = async (comment: ReviewComment) => {
     const { promise, resolve: settle } = Promise.withResolvers<{ success: boolean; error?: string }>()
     const target = opts.target()
     const context = resolve(comment)
@@ -122,7 +124,12 @@ export async function postAllGithub(
 ): Promise<{ posted: ReviewComment[]; failure?: string }> {
   const posted: ReviewComment[] = []
   for (const comment of comments) {
-    const result = await github.send(comment)
+    // A rejected send is a failed request too. Convert it into a result so the
+    // batch stops at the first failure and the caller can clear its pending state.
+    const result = await github.send(comment).then(
+      (value) => value,
+      (error: unknown) => ({ success: false, error: error instanceof Error ? error.message : String(error) }),
+    )
     if (!result.success) return { posted, failure: result.error }
     posted.push(comment)
   }

packages/kilo-vscode/webview-ui/src/hooks/useFileMention.ts

@@ -798,7 +798,10 @@ export function useFileMention(
     setText(textarea.value)
     closeMention()
     onSelect?.()
-    return true
+    // execCommand can silently no-op when the editor is not editable. Report the
+    // drop as unhandled when the text did not change so callers do not treat a
+    // failed insert as a consumed drag.
+    return textarea.value !== val
   }
 
   const insertDrop = (