Fading handshake (#2474)

## Description:
Add dynamic alliance icon with time-based fill and extension request
indicator

- Implement bottom-up green fill on alliance icon proportional to
remaining time
- Use AllianceIconFaded.svg as base layer with green overlay clipped
from top
- Add 20-82.40% clip range to account for icon vertical offset 

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced


<img width="1132" height="631" alt="Screenshot 2025-11-18 205205"
src="https://github.com/user-attachments/assets/4af71ddc-f847-4460-9046-167275efc773"
/>
<img width="1387" height="792" alt="Screenshot 2025-11-18 205532"
src="https://github.com/user-attachments/assets/9dd0e018-323f-4de1-bae8-2633c09fe867"
/>

## Please put your Discord username so you can be contacted if a bug or
regression is found:
hauke4707

---------

Co-authored-by: Evan <evanpelle@gmail.com>

src/core/game/PlayerImpl.ts

@@ -171,6 +171,10 @@ export class PlayerImpl implements Player {
             other: a.other(this).id(),
             createdAt: a.createdAt(),
             expiresAt: a.expiresAt(),
+            hasExtensionRequest:
+              a.expiresAt() <=
+              this.mg.ticks() +
+                this.mg.config().allianceExtensionPromptOffset(),
           }) satisfies AllianceView,
       ),
       hasSpawned: this.hasSpawned(),