extend build-info bake to name + tagline + repository

User asked for the rest of the pubspec-derived strings to share the
same path the version went down. gen-build-info now also writes
`clideName`, `clideTagline`, `clideRepository` to
lib/src/build_info.g.dart from pubspec.yaml. Added a `tagline:`
field to pubspec for the short user-facing line (the welcome
subtitle, future web meta) — pubspec stays the single source of
truth for every name/tagline/version/repository string the app
shows.

Consumers swept:
* welcome banner ('clide' / 'IDE for Claude Code CLI') and status
  line version label read from the constants.
* app.dart WidgetsApp title + project-switcher label use clideName.
* clide_column_hat uses clideName for the empty-projects fallback.

Co-Authored-By: Claude <noreply@anthropic.com>

lib/app.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io' show Platform, Process, ProcessStartMode;
 
 import 'package:clide/builtin/welcome/src/welcome_view.dart';
+import 'package:clide/clide.dart' show clideName;
 import 'package:clide/extension/src/contribution.dart';
 import 'package:clide/kernel/kernel.dart';
 import 'package:clide/widgets/widgets.dart';
@@ -34,7 +35,7 @@ class _AppRoot extends StatelessWidget {
   Widget build(BuildContext context) {
     return WidgetsApp(
       debugShowCheckedModeBanner: false,
-      title: 'clide',
+      title: clideName,
       color: const Color(0xFF000000),
       pageRouteBuilder: <T>(RouteSettings settings, WidgetBuilder builder) => PageRouteBuilder<T>(
         settings: settings,
@@ -380,7 +381,7 @@ class _ProjectSwitcherButton extends StatelessWidget {
       listenable: kernel.project,
       builder: (ctx, _) {
         final name = kernel.project.current?.path.split('/').last;
-        final label = name != null ? 'clide > $name' : 'clide';
+        final label = name != null ? '$clideName > $name' : clideName;
         return ClideTappable(
           onTap: _openSwitcher,
           builder: (context, hovered, _) => Row(

lib/builtin/welcome/src/welcome_view.dart

@@ -1,6 +1,6 @@
 import 'dart:async';
 
-import 'package:clide/clide.dart' show clideVersion;
+import 'package:clide/clide.dart' show clideName, clideTagline, clideVersion;
 import 'package:clide/kernel/kernel.dart';
 import 'package:clide/widgets/widgets.dart';
 import 'package:flutter/services.dart' show MissingPluginException;
@@ -135,8 +135,8 @@ class _Header extends StatelessWidget {
         Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            ClideText('clide', fontSize: clideFontWelcomeBanner, fontWeight: FontWeight.w300, color: tokens.globalForeground),
-            ClideText('IDE for Claude Code CLI', muted: true, fontSize: clideFontDialogTitle),
+            ClideText(clideName, fontSize: clideFontWelcomeBanner, fontWeight: FontWeight.w300, color: tokens.globalForeground),
+            ClideText(clideTagline, muted: true, fontSize: clideFontDialogTitle),
           ],
         ),
       ],
@@ -401,7 +401,7 @@ class _StatusLine extends StatelessWidget {
           child: Row(
             mainAxisSize: MainAxisSize.min,
             children: [
-              ClideText('clide $clideVersion', muted: true, fontSize: clideFontSmall, fontFamily: clideMonoFamily),
+              ClideText('$clideName $clideVersion', muted: true, fontSize: clideFontSmall, fontFamily: clideMonoFamily),
               ClideText('  ·  ', muted: true, fontSize: clideFontSmall),
               if (!tc.resolved)
                 ClideText('checking…', muted: true, fontSize: clideFontSmall, fontFamily: clideMonoFamily)

lib/clide.dart

@@ -27,8 +27,8 @@ export 'src/ipc/schema_v1.dart';
 export 'src/panes/event_sink.dart';
 export 'src/panes/pane.dart' show Pane, PaneKind;
 
-// clideVersion / clideCommit / clideDate live in lib/src/build_info.g.dart,
-// regenerated by every `make` build/run/test target from pubspec.yaml +
-// git short SHA + current UTC time. See `gen-build-info` in the
-// Makefile.
-export 'src/build_info.g.dart' show clideVersion, clideCommit, clideDate;
+// clideName, clideTagline, clideVersion, clideRepository, clideCommit,
+// clideDate live in lib/src/build_info.g.dart, regenerated by every
+// `make` build/run/test target from pubspec.yaml + git short SHA +
+// current UTC time. See `gen-build-info` in the Makefile.
+export 'src/build_info.g.dart' show clideName, clideTagline, clideVersion, clideRepository, clideCommit, clideDate;

lib/widgets/src/clide_column_hat.dart

@@ -1,5 +1,6 @@
 import 'dart:io' show Platform;
 
+import 'package:clide/clide.dart' show clideName;
 import 'package:clide/kernel/src/theme/controller.dart';
 import 'package:clide/kernel/src/theme/tokens.dart';
 import 'package:clide/kernel/src/window_controls.dart';
@@ -71,7 +72,7 @@ class _CenterContent extends StatelessWidget {
     final parts = <String>[];
     if (project != null) parts.add(project!);
     if (branch != null) parts.add(branch!);
-    final label = parts.isEmpty ? 'clide' : parts.join(' > ');
+    final label = parts.isEmpty ? clideName : parts.join(' > ');
     return Center(
       child: ClideText(label, fontSize: 12, color: tokens.globalTextMuted, fontFamily: clideMonoFamily),
     );