backport: feat(ui): add Auto Update button for dashmate RPC password

[lklimek]

Summary

• Adds read_dashmate_rpc_password() function that reads the RPC password from ~/.dashmate/config.json
• Adds "Auto Update" button next to the local network password field in the Network Chooser screen
• On click, reads password from dashmate config (local_seed config name) and auto-fills + saves it

Note: When Auto Update fails (no dashmate installed, missing config), the error is only logged via tracing::error! — no user-visible feedback in the UI. Consider adding an inline error message.

Test plan

Manual test scenarios: docs/ai-design/2026-02-24-dashmate-auto-update/manual-test-scenarios.md

• Button present on Local Network tab
• Successful auto-fill with dashmate installed
• Graceful handling without dashmate (error logged)
• Manual Save button still works independently
• Password persists across app restart

_{🤖 Co-authored by Claudius the Magnificent AI Agent}

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📥 Commits

Reviewing files that changed from the base of the PR and between f6a09ee and d81b8e1.

📒 Files selected for processing (2)

• docs/ai-design/2026-02-24-dashmate-auto-update/manual-test-scenarios.md
• src/ui/network_chooser_screen.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch zk-extract/dashmate-auto-update

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