feat: add one-click nudge system with popover, throttling, and email notifications (Story 3.2)

Add NudgeController with 1-hour throttling per declaration, NudgePopover component
on declarations index and dashboard, shadcn-vue popover primitives, and per-declaration
nudge tracking. Owners/managers can nudge assigned workers with one click.
Includes 10 feature tests covering authorization, throttling, and cache invalidation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/Http/Controllers/NudgeController.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Concerns\HasWorkspaceScope;
+use App\Models\Declaration;
+use App\Notifications\NudgeNotification;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Cache;
+
+class NudgeController extends Controller
+{
+    use HasWorkspaceScope;
+
+    public function store(Request $request, Declaration $declaration): RedirectResponse
+    {
+        $this->authorizeWorkspaceAccess($declaration);
+
+        $workspace = $this->currentWorkspace();
+
+        $userRole = $workspace->users()
+            ->where('users.id', $request->user()->id)
+            ->first()
+            ?->pivot
+            ?->role
+            ?->value;
+
+        if (! in_array($userRole, ['owner', 'manager'])) {
+            abort(404);
+        }
+
+        $assignee = $declaration->assignee;
+
+        if (! $assignee) {
+            return back()->with('flash', ['type' => 'warning', 'message' => 'Cette déclaration n\'a pas de collaborateur assigné.']);
+        }
+
+        $recentNudge = $assignee
+            ->notifications()
+            ->where('type', NudgeNotification::class)
+            ->where('data->declaration_id', $declaration->id)
+            ->where('created_at', '>=', now()->subHour())
+            ->exists();
+
+        if ($recentNudge) {
+            return back()->with('flash', ['type' => 'warning', 'message' => 'Relance déjà envoyée récemment']);
+        }
+
+        $assignee->notify(new NudgeNotification($declaration, $request->user()));
+
+        activity()
+            ->performedOn($declaration)
+            ->causedBy($request->user())
+            ->log('nudged');
+
+        Cache::forget("user:{$assignee->id}:workspace:{$workspace->id}:unread_notifications");
+
+        return back()->with('flash', ['type' => 'success', 'message' => 'Relance envoyée à '.$assignee->name]);
+    }
+}