feat(ui): add bug report button in Help and Gitea issue template

Adds a "Report a bug" / "Segnala un bug" button (6 languages) in
Help → Info that opens the repository issue tracker in the system
browser via TopLevel.Launcher (cross-platform: desktop + Android).

Adds .gitea/ISSUE_TEMPLATE/bug_report.md — Gitea-compatible markdown
template with pre-filled sections for version, platform, network,
repro steps, expected behavior, and logs.

.gitea/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,41 @@
+---
+name: Bug Report
+about: Report a problem with Palladium Wallet
+title: "[BUG] "
+labels: bug
+---
+
+## Wallet version
+<!-- Shown in Help → Info, e.g. 1.0.0 -->
+
+
+## Platform
+<!-- Windows / Linux / Android -->
+
+
+## Network
+<!-- Mainnet / Testnet / Regtest -->
+
+
+## What happened?
+<!-- Describe the bug clearly. What did you see? What did you expect? -->
+
+
+## Steps to reproduce
+1. 
+2. 
+3. 
+
+## Expected behavior
+<!-- What should have happened instead? -->
+
+
+## Logs / error messages
+<!-- Paste any error dialogs, crash messages, or stack traces. Leave blank if none. -->
+
+```
+```
+
+## Checklist
+- [ ] I searched existing issues and this is not a duplicate
+- [ ] I reproduced this on the latest available version