feat(profiles): add Valve Steam Deck gamepad

[ReenigneArcher]

Description

Introduces a native Steam Deck controller profile (VID 0x28DE, PID 0x1205) across all supported backends:

• New GamepadProfileKind::steam_deck enum value and profiles::steam_deck() factory
• 64-byte vendor HID descriptor, native state packet packing (buttons, sticks, triggers, touch, motion)
• SteamDeckFeatureReportState shared helper for feature-report initialization (serial query, desktop-mapping commands, rumble via 0xEB)
• Linux uhid backend: 4 ms periodic reports, SET/GET feature handling, serial seeding from stable_id
• Windows backend: periodic state re-submission thread, feature-report responder, VHF queue dedup on button bytes
• FreeBSD uses uinput path for Steam Deck (same as Xbox/Switch)
• Four rear paddles (L4/R4/L5/R5) exposed via supported_rear_paddle_count = 4, Quick Access mapped to misc1
• Protocol constant LVH_WINDOWS_GAMEPAD_STEAM_DECK = 7, broker validation updated
• Full unit and consumer tests on Linux, Windows, and FreeBSD backends

Screenshot

Issues Fixed or Closed

• Resolves https://github.com/orgs/LizardByte/discussions/818

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

See our AI usage policy.

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
202	2	200	2

View the top 2 failed test(s) by shortest run time

LinuxConsumerTest::SdlSeesSteamDeckCanonicalButtonsAndRumble

Stack Traces | 3.2s run time

.../tests/unit/test_linux_consumers.cpp:697
Value of: wait_for_sdl_controller_button(controller.get(), sdl_button)
  Actual: false
Expected: true
logical button 0 controller_type=0 controller_button[0]=0 controller_button[1]=0 controller_button[2]=0 controller_button[3]=0 controller_button[4]=0 controller_button[5]=0 controller_button[6]=0 controller_button[7]=0 controller_button[8]=0 controller_button[9]=0 controller_button[10]=0 controller_button[11]=0 controller_button[12]=0 controller_button[13]=0 controller_button[14]=0 controller_button[15]=0 controller_button[16]=0 controller_button[17]=0 controller_button[18]=0 controller_button[19]=0 controller_button[20]=0 controller_axis[0]=0 controller_axis[1]=0 controller_axis[2]=0 controller_axis[3]=0 controller_axis[4]=0 controller_axis[5]=0 buttons=24 axes=10 button[0]=0 button[1]=0 button[2]=0 button[3]=0 button[4]=0 button[5]=0 button[6]=0 button[7]=0 button[8]=0 button[9]=0 button[10]=0 button[11]=0 button[12]=0 button[13]=0 button[14]=0 button[15]=0 button[16]=0 button[17]=0 button[18]=0 button[19]=0 button[20]=0 button[21]=0 button[22]=0 button[23]=0 axis[0]=0 axis[1]=0 axis[2]=0 axis[3]=0 axis[4]=0 axis[5]=0 axis[6]=0 axis[7]=0 axis[8]=-32768 axis[9]=-32768

WindowsConsumerTest::SdlHidapiRumbleReachesNativeControllerCallbacks

Stack Traces | 10.4s run time

D:\a\libvirtualhid\libvirtualhid\tests\unit\test_windows_consumers.cpp:484
Expected: (gamepad.get()) != (nullptr), actual: NULL vs (nullptr)
Google Test trace:
D:\a\libvirtualhid\libvirtualhid\tests\unit\test_windows_consumers.cpp(472): (libvirtualhid) Steam Deck Controller

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[sonarqubecloud]

Quality Gate failed

Failed conditions
5 New issues
5 New Code Smells (required ≤ 0)

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