Show app version in UI (welcome title + session sheet footer)

Reads the same stamped appVersion const the updater compares, so
the displayed version and the update logic can never disagree. Dev
runs show 0.0.0-dev.

AGENTS.md

@@ -24,8 +24,9 @@ pre-commit check. Tests run only when the code under test changed.
 
 ## Releases (user pushes tags, CI does the rest)
 
-Release flow: release commit bumps `apps/desktop/pubspec.yaml` →
-`git tag vX.Y.Z` → push tag → `.gitea/workflows/release.yml`
+Release flow: `tool/release.sh [patch|minor|major]` derives the
+version (no typing), bumps all pubspecs, commits, tags → review →
+`git push --follow-tags` → `.gitea/workflows/release.yml`
 builds, publishes the Forgejo release, commits
 `updates/manifest.json` back. `tool/release_publish.sh` is the same
 flow by hand. Workflows live in `.gitea/workflows` (this forge reads

apps/desktop/lib/src/screens/session_screen.dart

@@ -6,6 +6,7 @@ import 'package:sync_relay_core/core.dart';
 
 import '../session/health.dart';
 import '../state/session_state.dart';
+import '../update/updater.dart';
 import '../widgets/dialogs.dart';
 import '../widgets/member_avatar.dart';
 import '../widgets/window_buttons.dart';
@@ -681,6 +682,10 @@ class _SheetPanel extends StatelessWidget {
                     onPressed: onLeave,
                   ),
                 ),
+                const SizedBox(height: 8),
+                const Center(
+                  child: Text('v$appVersion', style: TextStyle(fontSize: 11, color: Colors.grey)),
+                ),
               ],
             );
           },

apps/desktop/lib/src/screens/welcome_screen.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import '../state/session_state.dart';
+import '../update/updater.dart';
 import '../widgets/window_chrome_bar.dart';
 
 class WelcomeScreen extends StatelessWidget {
@@ -32,6 +33,7 @@ class _WelcomeBody extends StatelessWidget {
             mainAxisSize: MainAxisSize.min,
             children: [
               const Text('Watch Together', style: TextStyle(fontSize: 24)),
+              Text('v$appVersion', style: const TextStyle(fontSize: 12, color: Colors.grey)),
               const SizedBox(height: 8),
               const Text(
                 'Set your name + avatar on the next screen.',

docs/ROADMAP.md

@@ -24,10 +24,11 @@ desktop 17 + 7 updater.
 
 ## Backlog (priority order, each one sitting-sized)
 
-1. First real release: release commit bumps desktop pubspec, tag
-   `v0.2.0`, CI (`release.yml`) builds the tarball, publishes the
-   Forgejo release, and commits the manifest back. Verifies the
-   whole `--upgrade` chain end to end. Manual fallback is
+1. First real release: `tool/release.sh` (derives the version,
+   no typing) → review → `git push --follow-tags` → CI
+   (`release.yml`) builds the tarball, publishes the Forgejo
+   release, and commits the manifest back. Verifies the whole
+   `--upgrade` chain end to end. Manual fallback is
    `tool/package_linux.sh` + `tool/release_publish.sh <tag>`.
 2. Jumpy seek: live repro with timeline log first, then fix the
    seek-land retry vs deadband/debounce fight.

tool/release.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+# Cut a release without typing a version anywhere: derives the next
+# version (patch by default), bumps all three pubspecs in lockstep,
+# commits, and tags. Review, then `git push --follow-tags` — CI takes
+# it from there (build, Forgejo release, manifest commit-back).
+# Usage: tool/release.sh [patch|minor|major] [--dry-run]
+set -euo pipefail
+
+BUMP=patch
+DRY=0
+for arg in "$@"; do
+  case "$arg" in
+    patch|minor|major) BUMP="$arg" ;;
+    --dry-run) DRY=1 ;;
+    *) echo "usage: $0 [patch|minor|major] [--dry-run]" >&2; exit 1 ;;
+  esac
+done
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+PUBSPECS="apps/desktop/pubspec.yaml packages/core/pubspec.yaml packages/server/pubspec.yaml"
+
+LATEST="$(git -C "$ROOT" describe --tags --abbrev=0 2>/dev/null || true)"
+if [[ -z "$LATEST" ]]; then
+  VER="$(sed -n 's/^version: \([0-9.]*\).*/\1/p' "$ROOT/apps/desktop/pubspec.yaml")"
+  WHY="no tags yet — first release takes the pubspec version"
+else
+  BASE="${LATEST#v}"
+  IFS=. read -r MA MI PA <<<"$BASE"
+  case "$BUMP" in
+    major) MA=$((MA + 1)); MI=0; PA=0 ;;
+    minor) MI=$((MI + 1)); PA=0 ;;
+    patch) PA=$((PA + 1)) ;;
+  esac
+  VER="$MA.$MI.$PA"
+  WHY="bump $BUMP from $LATEST"
+fi
+if git -C "$ROOT" rev-parse "v$VER" >/dev/null 2>&1; then
+  echo "error: tag v$VER already exists" >&2
+  exit 1
+fi
+echo "release will be v$VER ($WHY)"
+
+if [[ "$DRY" == "1" ]]; then
+  exit 0
+fi
+for f in $PUBSPECS; do
+  sed -i -E "s/^version: .*/version: $VER/" "$ROOT/$f"
+done
+git -C "$ROOT" add $PUBSPECS
+if git -C "$ROOT" diff --cached --quiet; then
+  echo "pubspecs already at $VER — tagging only"
+else
+  git -C "$ROOT" commit -m "Release v$VER" -- $PUBSPECS
+fi
+git -C "$ROOT" tag "v$VER"
+echo "review with: git show v$VER — then: git push --follow-tags"