Improve scanner reliability, tuner handover, and responsive controls

[DABodr]

What changed

• Retry transient telemetry timeouts and preserve useful error details after the final failed attempt.
• Wait for tuner frequency confirmation before measuring a station, improving compatibility with slower TEF tuners.
• Prevent FM Scan Monitor and Highpoint Scanner from issuing competing frequency commands.
• Add a compact live scanner status and tuner-handover control inside the existing Frequency card.
• Resume immediately after an explicit Release tuner action while retaining the reconnect grace period after an unexpected disconnect.
• Add a native Scan Monitor shortcut beside the Webserver plugin icons.
• Refine desktop and mobile typography, countdown visibility, running indication, spacing, and iOS cache compatibility.
• Update the plugin metadata and documentation for version 0.9.13.

Why

Long-running scans need to remain reliable across temporary telemetry failures, slower tuners, public tuner handovers, browser reconnects, and concurrent scanner plugins. The controls also need to remain clear and readable on both desktop and mobile without modifying the FM-DX Webserver core.

User impact

• More reliable station logging and tuner synchronization.
• Safer interaction with Highpoint Scanner.
• Immediate feedback and scan resumption after releasing the tuner.
• Clearer, more accessible controls on Windows, Linux, Raspberry Pi OS, Android, iPhone, and iPad browsers.

Validation

• node --check FMScanMonitor/fm-scan-monitor.js
• node --check FMScanMonitor/fm-scan-monitor_server.js
• 32 automated tests passing across engine, asset publication, and client integration suites.

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