Add bundled Plus Jakarta Sans font and update test configuration

- Introduced Plus Jakarta Sans font files to the project, ensuring they are loaded from assets for offline use.
- Updated README.md to document the font usage and regeneration instructions.
- Configured the test setup to prevent network fetching of fonts during tests, ensuring deterministic test results.

Author: CephasTechOrg

mobile/assets/google_fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2020 The Plus Jakarta Sans Project Authors (https://github.com/tokotype/PlusJakartaSans)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

mobile/assets/google_fonts/PlusJakartaSans-Black.ttf

@@ -0,0 +1,31 @@
+# Bundled Plus Jakarta Sans (✅ in place)
+
+The app uses **Plus Jakarta Sans** as its base typeface via `google_fonts`. The
+static weights are bundled here so the font loads from assets — **never over the
+network** — which matters for an offline-first app and keeps tests deterministic.
+
+`lib/main.dart` sets `GoogleFonts.config.allowRuntimeFetching = false`, and
+`test/flutter_test_config.dart` does the same for tests, so a missing weight
+fails loudly instead of silently downloading.
+
+## Files present
+
+Generated from the official open-source variable font
+(`google/fonts` → `ofl/plusjakartasans`) via `fonttools` instancer, named to
+match what `google_fonts` looks up by filename:
+
+- `PlusJakartaSans-Regular.ttf`    (w400)
+- `PlusJakartaSans-Medium.ttf`     (w500)
+- `PlusJakartaSans-SemiBold.ttf`   (w600)
+- `PlusJakartaSans-Bold.ttf`       (w700)
+- `PlusJakartaSans-ExtraBold.ttf`  (w800)
+- `PlusJakartaSans-Black.ttf`      (w900 → pinned to 800, the family's max)
+- `OFL.txt`                        (SIL Open Font License — required)
+
+## Regenerating (if ever needed)
+
+```bash
+curl -sSL -o VF.ttf "https://raw.githubusercontent.com/google/fonts/main/ofl/plusjakartasans/PlusJakartaSans%5Bwght%5D.ttf"
+python -m pip install fonttools
+# then instance wght=400/500/600/700/800 with fontTools.varLib.instancer
+```

mobile/assets/google_fonts/PlusJakartaSans-Bold.ttf

@@ -69,6 +69,11 @@ class _SalesScreenState extends ConsumerState<SalesScreen> {
   @override
   Widget build(BuildContext context) {
     final cart = ref.watch(salesCartProvider);
+    // Size the hero to its content (status-bar inset + title + top-seller banner)
+    // plus a small gap, instead of a fixed height. This keeps the space between
+    // the top-seller card and the bottom of the green header tight and
+    // consistent across devices, instead of a large variable gap.
+    final topPad = MediaQuery.paddingOf(context).top;
     final merchantAsync = ref.watch(merchantContextProvider);
     final inventoryAsync = ref.watch(inventoryControllerProvider);
     final salesAsync = ref.watch(salesControllerProvider);
@@ -169,7 +174,7 @@ class _SalesScreenState extends ConsumerState<SalesScreen> {
           NestedScrollView(
             headerSliverBuilder: (context, innerBoxIsScrolled) => [
               SliverAppBar(
-                expandedHeight: 218,
+                expandedHeight: topPad + 170,
                 pinned: true,
                 backgroundColor: const Color(0xFF041509),
                 elevation: 0,

mobile/assets/google_fonts/PlusJakartaSans-ExtraBold.ttf

@@ -997,6 +997,7 @@ class _DisconnectDialogState extends State<_DisconnectDialog> {
                   color: DashboardMockup.ink)),
           const SizedBox(height: 8),
           TextField(
+            key: const Key('disconnect_confirm_input'),
             controller: _ctrl,
             autofocus: true,
             textCapitalization: TextCapitalization.characters,