RNode: add Germany Ruhrgebiet preset and raise custom TX power cap to 27 dBm

[torlando-tech]

Summary

Two small RNode changes, isolated from unrelated in-flight work.

1. New "Popular Local Preset" for Germany - Ruhrgebiet

• freq 869462500 Hz (869.4625 MHz), bw 125 kHz, SF 8, CR 5, TX max 27 dBm, LT airtime 10%.
• The frequency is in EU sub-band P (869.4-869.65 MHz), whose regulatory limit is 27 dBm / 10% duty, so the preset is compliant.
• RNodeRegionalPreset gains an optional longTermAirtimeLimit, applied to the lt_alock field on selection (short-term st_alock untouched). A "10% LT" chip is shown on the preset card when a preset defines it.

2. Custom config TX power cap 22 -> 27 dBm

• RNodeConfigValidator.DEFAULT_MAX_TX_POWER 22 -> 27, plus the ReviewConfigStep fallback and the ReticulumConfig doc comment.
• No backend change needed: the Python backend already permits TX up to 36 dBm and surfaces device capability errors (0x40).

Testing

• Verified against main: :app:testNoSentryKotlinBackendDebugUnitTest for the touched classes = 258 tests, 0 failures/errors.
• New/updated tests: exact Ruhrgebiet field set; selectPreset applies TX 27 + LT 10%; preset without an airtime limit preserves the existing ltAlock; validator default max is now 27.

Notes

• Scoped to the 9 RNode files only; no unrelated changes included.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no outstanding findings after the earlier layout and compilation concerns were resolved.

Summary

• Adds optional preset-specific long-term airtime and transmit-power fields.
• Applies preset airtime limits while preserving existing values when an override is absent.
• Uses a wrapping settings layout and displays only the preset attributes that are defined.
• Updates validation, documentation, and unit tests for the new preset and power ceiling.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Select frequency region] --> B[Region-default TX power]
    B --> C[Select local preset]
    C --> D{Preset TX override?}
    D -->|Yes| E[Apply preset TX power]
    D -->|No| F[Keep current TX power]
    C --> G{Preset LT airtime limit?}
    G -->|Yes| H[Apply lt_alock]
    G -->|No| I[Keep current lt_alock]
    E --> J[Review and save]
    F --> J
    H --> J
    I --> J

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_{Reviews (6) · Last reviewed commit: "Revert "Remove TX power from RNode prese..."}

[codecov]

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