feat: optimize reaction message format to reduce airtime

- Reduce reaction payload from ~44 bytes to 9 bytes (5x smaller)
- Use 4-char hex hash (timestamp + sender + first 5 chars) for message ID
- Use 2-char hex emoji index instead of multi-byte UTF-8 emoji
- Format: r:HASH:INDEX (e.g., r:a1b2:00)
- For 1:1 chats, sender is implicit (null) for shorter hash
- Prevent users from reacting to their own messages
- Add room server reaction support with sender identification
- Make emoji lists public in EmojiPicker for shared indexing
- Add 💪 and 🚀 emojis to picker
- Add comprehensive unit tests for reaction helpers
- Update minor dependencies

pubspec.lock

@@ -97,6 +97,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.2"
+  code_assets:
+    dependency: transitive
+    description:
+      name: code_assets
+      sha256: "83ccdaa064c980b5596c35dd64a8d3ecc68620174ab9b90b6343b753aa721687"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   collection:
     dependency: transitive
     description:
@@ -157,10 +165,10 @@ packages:
     dependency: transitive
     description:
       name: ffi
-      sha256: "289279317b4b16eb2bb7e271abccd4bf84ec9bdcbe999e278a94b804f5630418"
+      sha256: d07d37192dbf97461359c1518788f203b0c9102cfd2c35a716b823741219542c
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.4"
+    version: "2.1.5"
   file:
     dependency: transitive
     description:
@@ -234,10 +242,10 @@ packages:
     dependency: transitive
     description:
       name: flutter_blue_plus_winrt
-      sha256: "0c87ca5bdf1a110d42847edeca8fbb11a9701738dc8526aefbb2a115bea29aef"
+      sha256: "34be2d8e23d5881b46accebb0e71025f7d52869d72ea98b5082c20764e06aa80"
       url: "https://pub.dev"
     source: hosted
-    version: "0.0.10"
+    version: "0.0.16"
   flutter_cache_manager:
     dependency: "direct main"
     description:
@@ -325,6 +333,22 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: c3f1ee72c96f8f78935e18aa8cecced9ab132419e8625dc187e1c2408efc20de
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.3"
+  hooks:
+    dependency: transitive
+    description:
+      name: hooks
+      sha256: "5d309c86e7ce34cd8e37aa71cb30cb652d3829b900ab145e4d9da564b31d59f7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   http:
     dependency: "direct main"
     description:
@@ -369,10 +393,10 @@ packages:
     dependency: transitive
     description:
       name: json_annotation
-      sha256: "1ce844379ca14835a50d2f019a3099f419082cfdd231cd86a142af94dd5c6bb1"
+      sha256: "805fa86df56383000f640384b282ce0cb8431f1a7a2396de92fb66186d8c57df"
       url: "https://pub.dev"
     source: hosted
-    version: "4.9.0"
+    version: "4.10.0"
   latlong2:
     dependency: "direct main"
     description:
@@ -437,6 +461,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.6.2"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
   matcher:
     dependency: transitive
     description:
@@ -477,6 +509,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.11"
+  native_toolchain_c:
+    dependency: transitive
+    description:
+      name: native_toolchain_c
+      sha256: "89e83885ba09da5fdf2cdacc8002a712ca238c28b7f717910b34bcd27b0d03ac"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.17.4"
   nested:
     dependency: transitive
     description:
@@ -485,6 +525,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  objective_c:
+    dependency: transitive
+    description:
+      name: objective_c
+      sha256: "983c7fa1501f6dcc0cb7af4e42072e9993cb28d73604d25ebf4dab08165d997e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.2.5"
   octo_image:
     dependency: transitive
     description:
@@ -537,10 +585,10 @@ packages:
     dependency: transitive
     description:
       name: path_provider_foundation
-      sha256: "6d13aece7b3f5c5a9731eaf553ff9dcbc2eff41087fd2df587fd0fed9a3eb0c4"
+      sha256: "2a376b7d6392d80cd3705782d2caa734ca4727776db0b6ec36ef3f1855197699"
       url: "https://pub.dev"
     source: hosted
-    version: "2.5.1"
+    version: "2.6.0"
   path_provider_linux:
     dependency: transitive
     description:
@@ -629,6 +677,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.1.5+1"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "5bfcf68ca79ef689f8990d1160781b4bad40a3bd5e5218ad4076ddb7f4081585"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
   qr:
     dependency: transitive
     description:
@@ -665,10 +721,10 @@ packages:
     dependency: transitive
     description:
       name: shared_preferences_android
-      sha256: "83af5c682796c0f7719c2bbf74792d113e40ae97981b8f266fa84574573556bc"
+      sha256: cbc40be9be1c5af4dab4d6e0de4d5d3729e6f3d65b89d21e1815d57705644a6f
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.18"
+    version: "2.4.20"
   shared_preferences_foundation:
     dependency: transitive
     description:
@@ -987,5 +1043,5 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.10.0 <4.0.0"
-  flutter: ">=3.38.0"
+  dart: ">=3.10.3 <4.0.0"
+  flutter: ">=3.38.4"