feat(extension): complete VS Code extension with kanban board interface (#997)

---------
Co-authored-by: DavidMaliglowka <13022280+DavidMaliglowka@users.noreply.github.com>
Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

apps/extension/src/services/polling-strategies.ts

@@ -0,0 +1,67 @@
+/**
+ * Polling Strategies - Simplified
+ * Different algorithms for polling intervals
+ */
+
+import type { PollingStrategy } from './polling-service';
+
+/**
+ * Fixed interval polling
+ */
+export class FixedIntervalStrategy implements PollingStrategy {
+	constructor(private interval = 10000) {}
+
+	calculateNextInterval(): number {
+		return this.interval;
+	}
+
+	getName(): string {
+		return 'fixed';
+	}
+}
+
+/**
+ * Adaptive polling based on activity
+ */
+export class AdaptivePollingStrategy implements PollingStrategy {
+	private readonly MIN_INTERVAL = 5000; // 5 seconds
+	private readonly MAX_INTERVAL = 60000; // 1 minute
+	private readonly BASE_INTERVAL = 10000; // 10 seconds
+
+	calculateNextInterval(consecutiveNoChanges: number): number {
+		// Start with base interval
+		let interval = this.BASE_INTERVAL;
+
+		// If no changes for a while, slow down
+		if (consecutiveNoChanges > 5) {
+			interval = Math.min(
+				this.MAX_INTERVAL,
+				this.BASE_INTERVAL * 1.5 ** (consecutiveNoChanges - 5)
+			);
+		} else if (consecutiveNoChanges === 0) {
+			// Recent change, poll more frequently
+			interval = this.MIN_INTERVAL;
+		}
+
+		return Math.round(interval);
+	}
+
+	getName(): string {
+		return 'adaptive';
+	}
+}
+
+/**
+ * Create polling strategy from configuration
+ */
+export function createPollingStrategy(config: any): PollingStrategy {
+	const type = config.get('polling.strategy', 'adaptive');
+	const interval = config.get('polling.interval', 10000);
+
+	switch (type) {
+		case 'fixed':
+			return new FixedIntervalStrategy(interval);
+		default:
+			return new AdaptivePollingStrategy();
+	}
+}