Fix layout height and grammar in WhoShouldUse component

[Copilot]

Two minor but incorrect values in WhoShouldUse.js: an atypical 104% height causing potential layout overflow, and a grammatical error in the Gateway Client description copy.

Changes

• Layout: height: "104%" → height: "100%" on the inner Grid container to align with parent sizing
• Copy: "it goes via SMS to a Gateway Clients" → "a Gateway Client" (singular — refers to one device bridging the connection)

Original prompt

Please apply the following diffs and create a pull request.
Once the PR is ready, give it a title based on the messages of the fixes being applied.

[{"message":"The height value of '104%' appears to be an unusual choice and may cause layout issues. Consider using '100%' for consistent sizing with the parent container, or explain the reason for the extra 4% if intentional.","fixFiles":[{"filePath":"src/Components/WhoShouldUse.js","diff":"diff --git a/src/Components/WhoShouldUse.js b/src/Components/WhoShouldUse.js\n--- a/src/Components/WhoShouldUse.js\n+++ b/src/Components/WhoShouldUse.js\n@@ -94,7 +94,7 @@\n \t\t\t\t\t\t\tdirection=\"column\"\n \t\t\t\t\t\t\tspacing={4}\n \t\t\t\t\t\t\tsx={{\n-\t\t\t\t\t\t\t\theight: \"104%\",\n+\t\t\t\t\t\t\t\theight: \"100%\",\n \t\t\t\t\t\t\t\tflex: 1,\n \t\t\t\t\t\t\t\t\"& .MuiGrid-item\": {\n \t\t\t\t\t\t\t\t\tdisplay: \"flex\",\n"}]},{"message":"Grammar error: 'Gateway Clients' should be singular 'a Gateway Client' when referring to a single device.","fixFiles":[{"filePath":"src/Components/WhoShouldUse.js","diff":"diff --git a/src/Components/WhoShouldUse.js b/src/Components/WhoShouldUse.js\n--- a/src/Components/WhoShouldUse.js\n+++ b/src/Components/WhoShouldUse.js\n@@ -198,7 +198,7 @@\n \t\t\t\t\t\t\t\t\t>\n \t\t\t\t\t\t\t\t\t\t{t(\n \t\t\t\t\t\t\t\t\t\t\t\"GatewayClient.Description\",\n-\t\t\t\t\t\t\t\t\t\t\t\"Gateway Clients are devices with active internet that act as a bridge between offline users and online platforms. When you send a message without internet, it goes via SMS to a Gateway Clients which forwards it to your selected platform. Within the app, Gateway Clients are listed under the Countries tab. They can be set up using the DekuSMS app.\"\n+\t\t\t\t\t\t\t\t\t\t\t\"Gateway Clients are devices with active internet that act as a bridge between offline users and online platforms. When you send a message without internet, it goes via SMS to a Gateway Client which forwards it to your selected platform. Within the app, Gateway Clients are listed under the Countries tab. They can be set up using the DekuSMS app.\"\n \t\t\t\t\t\t\t\t\t\t)}\n \t\t\t\t\t\t\t\t\t</Typography>\n \t\t\t\t\t\t\t\t\t<Button\n"}]}]