feat(review): auto-continue merge and poll provider after push

Coordinate local conflict resolutions with automated push and provider-
side merge status checks. When a local resolution completes the app
advances the merge workflow, pushes the updated branch, and attempts to
continue the merge. The UI shows a checking state and disables relevant
actions while the provider rechecks to prevent duplicate operations.
This streamlines finishing conflict resolution and keeps PR status in
sync with remote providers.

- Automatically push and continue merge when local resolutions finish
- Poll provider for updated mergeability and refresh request details
- Add guards to disable UI actions while waiting for remote status

src/App.svelte

@@ -2700,7 +2700,6 @@
       const sourceBranch = localSource?.name ?? remoteSource?.name;
       if (!sourceBranch) throw new Error(appLanguage === "de" ? `Der Quellbranch „${request.sourceBranch}“ wurde lokal und auf ${match.remote.name} nicht gefunden.` : `The source branch “${request.sourceBranch}” was not found locally or on ${match.remote.name}.`);
       if (status?.current_branch !== request.sourceBranch) applyStatus(await checkoutBranch(match.path, sourceBranch));
-      if ((status?.ahead ?? 0) > 0) throw new Error(appLanguage === "de" ? `Der lokale Branch „${request.sourceBranch}“ enthält noch nicht gepushte Commits. Pushe oder sichere sie zuerst.` : `The local branch “${request.sourceBranch}” contains unpushed commits. Push or preserve them first.`);
       if (remoteSource) applyStatus(await mergeBranch(match.path, remoteSource.name, "ff-only"));
       const targetBranch = availableBranches.some((branch) => branch.remote && branch.name === `${match.remote.name}/${request.targetBranch}`)
         ? `${match.remote.name}/${request.targetBranch}`
@@ -2717,6 +2716,8 @@
       } else {
         reviewConflictPhase = "ready-to-push";
         reviewConflictMessage = appLanguage === "de" ? "Der Zielbranch wurde ohne Dateikonflikte übernommen. Der Quellbranch kann jetzt gepusht werden." : "The target branch was merged without file conflicts. The source branch is ready to push.";
+        await tick();
+        await pushReviewConflictResolution();
       }
       trackEvent("review_conflict_resolution_started");
     } catch (error) {
@@ -2731,12 +2732,19 @@
   }
 
   async function continueReviewConflictMerge() {
-    if (reviewConflictPhase !== "ready-to-continue" || hasConflicts || !mergeInProgress) return;
+    if (!reviewConflictRequestId || hasConflicts || !mergeInProgress || isBusy) return;
+    reviewConflictPhase = "ready-to-continue";
+    reviewConflictMessage = appLanguage === "de" ? "Der Merge-Commit wird erstellt …" : "Creating the merge commit …";
     await continueMerge();
     activeView = "review-center";
+    await tick();
     if (!errorMessage && !mergeInProgress) {
       reviewConflictPhase = "ready-to-push";
       reviewConflictMessage = appLanguage === "de" ? "Der Merge ist abgeschlossen. Pushe den Quellbranch, damit der PR aktualisiert wird." : "The merge is complete. Push the source branch to update the pull request.";
+      await tick();
+      await pushReviewConflictResolution();
+    } else if (errorMessage) {
+      reviewConflictMessage = appLanguage === "de" ? `Der Merge-Commit konnte nicht erstellt werden: ${errorMessage}` : `The merge commit could not be created: ${errorMessage}`;
     }
   }
 
@@ -5273,6 +5281,7 @@
   async function applyPreparedResolutions() {
     if (!activeRepoPath || isBusy || Object.keys(preparedResolutions).length === 0) return;
     const entries = Object.entries(preparedResolutions);
+    let completeReviewMerge = false;
     await runOperation(`Resolving ${entries.length} ${entries.length === 1 ? "file" : "files"}`, async () => {
       let nextStatus: GitStatus | null = null;
       for (const [file, prepared] of entries) {
@@ -5291,6 +5300,12 @@
         resolveDialogOpen = false;
         conflict = null;
         conflictTarget = "";
+        completeReviewMerge = Boolean(
+          reviewConflictRequestId
+          && reviewConflictRepoPath
+          && sameRepoPath(activeRepoPath, reviewConflictRepoPath)
+          && nextStatus?.merge_in_progress,
+        );
       } else {
         await loadConflict(remaining[0].path);
       }
@@ -5299,6 +5314,12 @@
         remaining: remaining.length,
       });
     });
+    if (completeReviewMerge && !errorMessage) {
+      reviewConflictPhase = "ready-to-continue";
+      activeView = "review-center";
+      await tick();
+      await continueReviewConflictMerge();
+    }
   }
 
   // ── Event handlers ─────────────────────────────────────────────────────────