Add initial configuration, tokens, and widgets for M3E components

- Introduced `.gitignore` and `.metadata` for apps and examples.
- Added Flutter/Dart analysis configurations (`analysis_options.yaml`).
- Implemented foundational tokens and themes for M3E (colors, shapes).
- Created base implementations for `IconButtonM3E` and `SplitButtonM3E`.
- Set up CI workflow (`ci.yaml`) to automate testing and analysis.

packages/m3e_collection/README.md

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+# m3e_collection
+
+Single import that re-exports all M3E component packages plus `m3e_design`.

packages/m3e_collection/lib/m3e_collection.dart

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+library m3e_collection;
+
+export 'package:app_bar_m3e/app_bar_m3e.dart';
+export 'package:button_group_m3e/button_group_m3e.dart';
+export 'package:button_m3e/button_m3e.dart';
+export 'package:fab_m3e/fab_m3e.dart';
+export 'package:icon_button_m3e/icon_button_m3e.dart';
+export 'package:loading_indicator_m3e/loading_indicator_m3e.dart';
+export 'package:m3e_design/m3e_design.dart';
+export 'package:material_new_shapes/material_new_shapes.dart';
+export 'package:navigation_bar_m3e/navigation_bar_m3e.dart';
+export 'package:navigation_rail_m3e/navigation_rail_m3e.dart';
+export 'package:progress_indicator_m3e/progress_indicator_m3e.dart';
+export 'package:slider_m3e/slider_m3e.dart';
+export 'package:split_button_m3e/split_button_m3e.dart';
+export 'package:toolbar_m3e/toolbar_m3e.dart';

packages/m3e_collection/melos_m3e_collection.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea" />
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.idea" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/android/.gradle" />
+      <excludeFolder url="file://$MODULE_DIR$/example/android/.idea" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/Flutter" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/Pods" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks" />
+      <excludeFolder url="file://$MODULE_DIR$/example/macos/Flutter" />
+      <excludeFolder url="file://$MODULE_DIR$/example/macos/Pods" />
+      <excludeFolder url="file://$MODULE_DIR$/example/macos/.symlinks" />
+    </content>
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Flutter Plugins" level="project" />
+    <orderEntry type="library" name="Dart Packages" level="project" />
+  </component>
+</module>

packages/m3e_collection/pubspec.yaml

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+name: m3e_collection
+description: Aggregated exports of all Material 3 Expressive components for Flutter.
+version: 0.1.0
+publish_to: none
+
+environment:
+  sdk: ">=3.5.0 <4.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  material_new_shapes: ^1.0.0
+  m3e_design:
+    path: ../m3e_design
+  icon_button_m3e:
+    path: ../icon_button_m3e
+  split_button_m3e:
+    path: ../split_button_m3e
+  button_group_m3e:
+    path: ../button_group_m3e
+  app_bar_m3e:
+    path: ../app_bar_m3e
+  button_m3e:
+    path: ../button_m3e
+  fab_m3e:
+    path: ../fab_m3e
+  loading_indicator_m3e:
+    path: ../loading_indicator_m3e
+  progress_indicator_m3e:
+    path: ../progress_indicator_m3e
+  navigation_bar_m3e:
+    path: ../navigation_bar_m3e
+  navigation_rail_m3e:
+    path: ../navigation_rail_m3e
+  slider_m3e:
+    path: ../slider_m3e
+  toolbar_m3e:
+    path: ../toolbar_m3e
+

packages/m3e_collection/pubspec_overrides.yaml

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+# melos_managed_dependency_overrides: icon_button_m3e,m3e_design,split_button_m3e,app_bar_m3e,button_m3e,fab_m3e,loading_indicator_m3e,progress_indicator_m3e,navigation_bar_m3e,navigation_rail_m3e,slider_m3e,toolbar_m3e,button_group_m3e
+dependency_overrides:
+  icon_button_m3e:
+    path: ..\\icon_button_m3e
+  m3e_design:
+    path: ..\\m3e_design
+  split_button_m3e:
+    path: ..\\split_button_m3e
+  app_bar_m3e:
+    path: ..\\app_bar_m3e
+  button_m3e:
+    path: ..\\button_m3e
+  fab_m3e:
+    path: ..\\fab_m3e
+  loading_indicator_m3e:
+    path: ..\\loading_indicator_m3e
+  progress_indicator_m3e:
+    path: ..\\progress_indicator_m3e
+  navigation_bar_m3e:
+    path: ..\\navigation_bar_m3e
+  navigation_rail_m3e:
+    path: ..\\navigation_rail_m3e
+  slider_m3e:
+    path: ..\\slider_m3e
+  toolbar_m3e:
+    path: ..\\toolbar_m3e
+  button_group_m3e:
+    path: ..\\button_group_m3e
+