Savings: add Belgium and update co2 with 2024 data

[eliaslecomte]

I've added Belgium to the data points 🥳 and then noticed that the co2 data wasn't from 2024. I've updated all listed / included countries.

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• Consider adding an explicit year field (e.g. year: 2024) alongside the co2 values so it’s clear which dataset these numbers correspond to and future updates are less error-prone.
• You may want to define and export a Region type/interface for the { name, co2 } objects so that any future additions (like Belgium here) are type-checked consistently across the codebase.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding an explicit `year` field (e.g. `year: 2024`) alongside the `co2` values so it’s clear which dataset these numbers correspond to and future updates are less error-prone.
- You may want to define and export a `Region` type/interface for the `{ name, co2 }` objects so that any future additions (like Belgium here) are type-checked consistently across the codebase.

## Individual Comments

### Comment 1
<location> `assets/js/components/Savings/co2Reference.ts:6-15` </location>
<code_context>
-  { name: "United Kingdom", co2: 257 },
-  { name: "United States", co2: 367 },
-  { name: "World", co2: 436 },
+  { name: "Australia", co2: 552 },
+  { name: "Austria", co2: 103 },
+  { name: "Belgium", co2: 118 },
+  { name: "Canada", co2: 175 },
+  { name: "Czech Republic", co2: 414 },
+  { name: "Denmark", co2: 143 },
+  { name: "Estonia", co2: 341 },
+  { name: "Europe", co2: 284 },
+  { name: "Finland", co2: 72 },
+  { name: "France", co2: 44 },
+  { name: "Germany", co2: 344 },
+  { name: "Netherlands", co2: 253 },
+  { name: "Norway", co2: 31 },
+  { name: "Poland", co2: 615 },
+  { name: "Sweden", co2: 36 },
+  { name: "Switzerland", co2: 37 },
+  { name: "United Kingdom", co2: 211 },
+  { name: "United States", co2: 384 },
+  { name: "World", co2: 473 },
 ];

</code_context>

<issue_to_address>
**suggestion (bug_risk):** Clarify or centralize the assumed units for `co2` values to avoid subtle misinterpretations elsewhere.

Since these values’ meaning depends on their units (e.g. gCO₂/kWh vs kgCO₂/MWh), consider exporting a shared unit constant alongside `regions` so all consumers format and convert them consistently and don’t accidentally assume a different scale.
</issue_to_address>

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[eliaslecomte]

Updated the tests and added 2024 to the comments. I think adding a Region interface / or adding 2024 to the data itself is a bit to much.

[naltatis]

Thanks for the update!