feat(portable): update management with per-track caching and flash-free detail refresh

- Full update system for Portable installs using update.py (pygit2-based)
- Two update tracks: Stable (--stable flag, latest tag) and Latest on GitHub (master HEAD)
- Check for Update fetches GitHub Releases/Commits API, stores results per-track in updateInfoByTrack
- Switching tracks instantly shows cached check results without re-fetching
- Update execution with 3-step progress, handles updater self-update flow
- Detail view uses targeted section refresh (replaceWith) instead of full page rebuild
- Extract _renderSection, _refreshSection, _refreshAllSections for flash-free updates
- List view shows amber update badge via getStatusTag()
- Modal messages linkify URLs (open in system browser) and are selectable with scroll
- Migrate legacy updateInfo to updateInfoByTrack on startup
- button.loading CSS class for inline check spinner

Amp-Thread-ID: https://ampcode.com/threads/T-019c6f48-6409-738c-8e1d-5bf37f16859e
Co-authored-by: Amp <amp@ampcode.com>

Author: Kosinkadink

lib/ipc.js

@@ -96,6 +96,14 @@ async function migrateDefaults() {
         changed = true;
       }
     }
+    // Migrate legacy updateInfo → updateInfoByTrack
+    if (inst.updateInfo && !inst.updateInfoByTrack) {
+      const track = inst.updateInfo.track || inst.updateTrack || "stable";
+      const { track: _t, ...rest } = inst.updateInfo;
+      inst.updateInfoByTrack = { [track]: rest };
+      delete inst.updateInfo;
+      changed = true;
+    }
   }
   if (changed) {
     for (const inst of all) await installations.update(inst.id, inst);
@@ -163,7 +171,9 @@ function register({ onLaunch, onStop, onComfyExited, onComfyRestarted } = {}) {
       const source = sourceMap[inst.sourceId];
       if (!source) return inst;
       const listPreview = source.getListPreview ? source.getListPreview(inst) : undefined;
-      const statusTag = inst.status === "failed" ? { label: "Install Failed", style: "danger" } : undefined;
+      const statusTag = inst.status === "failed"
+        ? { label: "Install Failed", style: "danger" }
+        : (source.getStatusTag ? source.getStatusTag(inst) : undefined);
       return { ...inst, sourceLabel: source.label, ...(listPreview != null ? { listPreview } : {}), ...(statusTag ? { statusTag } : {}) };
     });
   });
@@ -647,9 +657,14 @@ function register({ onLaunch, onStop, onComfyExited, onComfyRestarted } = {}) {
         sender.send("install-progress", { installationId, phase, ...detail });
       }
     };
+    const sendOutput = (text) => {
+      if (!sender.isDestroyed()) {
+        sender.send("comfy-output", { installationId, text });
+      }
+    };
     const update = (data) => installations.update(installationId, data);
     try {
-      return await resolveSource(inst.sourceId).handleAction(actionId, inst, actionData, { update, sendProgress });
+      return await resolveSource(inst.sourceId).handleAction(actionId, inst, actionData, { update, sendProgress, sendOutput });
     } catch (err) {
       return { ok: false, message: err.message };
     }

locales/en.json

@@ -134,6 +134,7 @@
     "openDirectory": "Open Directory",
     "checkForUpdate": "Check for Update",
     "featureNotImplemented": "This feature is not yet implemented.",
+    "updateAvailable": "Update Available",
     "delete": "Delete Installation",
     "deleteConfirmTitle": "Delete Installation",
     "deleteConfirmMessage": "This will permanently delete the installation and all its files. This cannot be undone.",
@@ -170,7 +171,29 @@
     "label": "Portable",
     "package": "Portable Package",
     "version": "Version",
-    "packageLabel": "Package"
+    "packageLabel": "Package",
+    "updates": "Updates",
+    "updateTrack": "Update Track",
+    "trackStable": "Stable",
+    "trackLatest": "Latest on GitHub",
+    "installedVersion": "Installed Version",
+    "latestVersion": "Latest Version",
+    "lastChecked": "Last Checked",
+    "updateStatus": "Status",
+    "updateAvailableTag": "Update: {version}",
+    "updateAvailable": "Update available",
+    "upToDate": "Up to date",
+    "updateNow": "Update Now",
+    "updateConfirmTitle": "Update ComfyUI",
+    "updateConfirmMessage": "Update from {installed} to {latest}?\n\nLocal changes will be stashed and a backup branch created.\n\nRelease notes:\n{notes}",
+    "updateConfirmMessageLatest": "Update from {installed} to latest on master ({latest})?\n\nThis will pull the newest commits from the master branch. Local changes will be stashed and a backup branch created.\n\nLatest commit: {commit}",
+    "updatingTitle": "Updating to {version}…",
+    "updatePrepare": "Prepare",
+    "updateRun": "Update",
+    "updateDeps": "Dependencies",
+    "updateFailed": "Update process failed with exit code {code}.",
+    "checkingForUpdate": "Checking for update…",
+    "noUpdateDir": "No update directory found in this portable installation."
   },
 
   "installer": {