docs: add platform-specific log paths to bug report template

Help users locate main process logs on macOS, Windows, and Linux,
and remind them to redact sensitive data before sharing.

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

Author: OpenSource03

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -113,7 +113,16 @@ body:
     attributes:
       label: Logs / Error Output
       description: |
-        Paste any relevant logs here. You can open DevTools via **Help → Toggle DevTools** and copy from the Console tab.
+        Paste any relevant logs here. **Please redact any sensitive data (API keys, tokens, passwords, file paths with personal info) before sharing.**
+
+        **Where to find logs:**
+        - **DevTools Console**: Help → Toggle DevTools → Console tab
+        - **Main process logs** (production):
+          - macOS: `~/Library/Application Support/Harnss/logs/`
+          - Windows: `%APPDATA%\Harnss\logs\`
+          - Linux: `~/.config/Harnss/logs/`
+
+        Log files are named `main-{timestamp}.log` — attach the most recent one.
       render: text
       placeholder: Paste logs here...