feat: pass --day-of-year to birda CLI for BSG SDM support

BSG models use day-of-year (1-366) for Species Distribution Model
filtering instead of month/day used by BirdNET range filtering.
Compute day-of-year from the recording date and pass both flags
so both model types work correctly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: tphakala

src/main/birda/runner.ts

@@ -11,6 +11,7 @@ interface AnalysisOptions {
   longitude?: number | undefined;
   month?: number | undefined;
   day?: number | undefined;
+  dayOfYear?: number | undefined;
   quiet?: boolean | undefined;
 }
 
@@ -94,6 +95,9 @@ export function runAnalysis(sourcePath: string, options: AnalysisOptions): Analy
       if (options.day !== undefined) {
         args.push('--day', String(options.day));
       }
+      if (options.dayOfYear !== undefined) {
+        args.push('--day-of-year', String(options.dayOfYear));
+      }
       if (options.quiet !== false) {
         args.push('-q');
       }

src/main/ipc/analysis.ts

@@ -76,6 +76,17 @@ export function registerAnalysisHandlers(): void {
       }
     }
 
+    // Compute day-of-year from month/day for BSG SDM support.
+    // BSG models use --day-of-year (1-366) instead of --month/--day.
+    // We pass both so BirdNET gets month/day and BSG gets day-of-year.
+    let dayOfYear: number | undefined;
+    if (month !== undefined && day !== undefined) {
+      const d = new Date(2024, month - 1, day); // leap year to handle Feb 29
+      const start = new Date(2024, 0, 0);
+      dayOfYear = Math.floor((d.getTime() - start.getTime()) / (1000 * 60 * 60 * 24));
+      sendLog(win, 'info', 'analysis', `Computed day-of-year: ${dayOfYear} (from month=${month}, day=${day})`);
+    }
+
     // Start analysis
     const handle = runAnalysis(request.source_path, {
       model: request.model,
@@ -84,6 +95,7 @@ export function registerAnalysisHandlers(): void {
       longitude: request.longitude,
       month,
       day,
+      dayOfYear,
     });
     currentAnalysis = handle;