Improve Notification Panel (#3913)

Resolves #3910

## Description:

- Split the events HUD into two components: a new
**`<actionable-events>`** that owns alliance prompts (request / renew)
and a slimmed-down **`<events-display>`** for everything else.
- Reworked `<events-display>` into two visual tiers: dim/scrolling tier
2 on top (trade results, unit losses, donations, alliance status),
prominent tier 1 anchored at the bottom (inbound nukes, naval invasion,
attack requests, alliance broken, conquered player, chat). Tier 2 caps
at the 4 newest entries; events expire after 8s.
- Added a transient **+gold pip** above the gold pill in
`<control-panel>`, animated with a small fade-in. Fires for trade ships,
trains, donations, and conquest. Trade-ship and train arrivals are
removed from the events scroll since they're surfaced here instead.
- New `MessageType.NUKE_DETONATED` and a server-side emission in
`NukeExecution.detonate` — once an inbound nuke lands or gets
intercepted, the inbound warning vanishes and a "detonated" entry takes
its place.
- `displayMessage` gained optional `unitID` and `focusPlayerID` params
so events can link to a unit or a player. Unit captures and destructions
now navigate to the unit's last tile when clicked; donations navigate to
the other player.
- ActionableEvents card width matches `<events-display>`; cards persist
until the user clicks Accept/Reject/Renew/Ignore or the server-side
request timeout expires.
- Removed the in-events category filter UI and the gold-amount banner —
`<events-display>` is now a lightweight log that hides entirely when
empty.

<img width="570" height="444" alt="Screenshot 2026-05-21 at 1 42 30 PM"
src="https://github.com/user-attachments/assets/f103efb3-0e11-4b72-a11b-91ff6896177c"
/>

<img width="430" height="296" alt="Screenshot 2026-05-21 at 1 41 34 PM"
src="https://github.com/user-attachments/assets/ae58475a-b252-4aa6-9ce5-99dea7575ce3"
/>

## 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

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

evan

tests/client/graphics/layers/ActionableEventsAlliance.test.ts

@@ -21,10 +21,10 @@ vi.mock("lit/directives/unsafe-html.js", () => ({
   UnsafeHTMLDirective: class {},
 }));
 
-import { EventsDisplay } from "../../../../src/client/hud/layers/EventsDisplay";
+import { ActionableEvents } from "../../../../src/client/hud/layers/ActionableEvents";
 import { MessageType } from "../../../../src/core/game/Game";
 
-describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
+describe("ActionableEvents - alliance renewal cleanup (allianceID based)", () => {
   function makeRenewal(
     allianceID: number,
     focusID: number,
@@ -40,7 +40,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   }
 
   test("removes ONLY renewal events for the broken alliance", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     const allianceAB = 1;
     const allianceAC = 2;
@@ -67,7 +67,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   });
 
   test("does NOT remove renewals just because the same player is involved", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     const allianceAB = 10;
     const allianceAC = 11;
@@ -86,7 +86,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   });
 
   test("breaking one alliance does not affect renewals between other players", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     const allianceAB = 100;
     const allianceCD = 200;
@@ -105,7 +105,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   });
 
   test("onAllianceExtensionEvent removes renewal when playerID matches myPlayer", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     const allianceID = 42;
     const mySmallID = 7;
@@ -127,7 +127,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   });
 
   test("onAllianceExtensionEvent keeps renewal when playerID does not match myPlayer", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     const allianceID = 42;
     const mySmallID = 7;
@@ -150,7 +150,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   });
 
   test("onAllianceExtensionEvent keeps renewal when myPlayer is null", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     const allianceID = 42;
 
@@ -171,7 +171,7 @@ describe("EventsDisplay - alliance renewal cleanup (allianceID based)", () => {
   });
 
   test("does not affect non-RENEW_ALLIANCE events", () => {
-    const display = new EventsDisplay();
+    const display = new ActionableEvents();
 
     (display as any).events = [
       {