fix all the compiler warnings

[miles-p]

the compiler warnings irritate me because they mean I have no clue whether the code i'm working on is the thing emitting all the warnings. in theory i'd love to put warnings-as-errors in the CI/CD pipeline but honestly who cares that much. may as well just keep the CI/CD as is. Thanks.

• Remove duplicate MX_GPIO_Init stub in i2c.c (real one lives in gpio.c)
• Wrap register-address ORs in imu.cpp with explicit uint8_t cast to
  silence narrowing conversion warnings
• Rewrite volatile ring-buffer size updates (++/--/+=/-=) as plain
  assignments in Port.hpp/cpp and PacketHandler.hpp; these compound
  forms are deprecated on volatile in C++20

[Copilot]

🟢 Ready to approve

The changes are narrow, consistent with the stated goal (warning cleanup), and appear behavior-preserving with no new correctness risks identified in the modified regions.

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Pull request overview

This PR focuses on eliminating noisy compiler warnings in the NUSense firmware so warning output is more actionable during development, without changing CI behavior or materially altering runtime logic.

Changes:

• Removes an unused/duplicate MX_GPIO_Init stub from i2c.c (the real GPIO init lives in gpio.c).
• Adds explicit uint8_t casts around IMU register address bitwise-OR operations to avoid narrowing warnings in brace-initialization.
• Rewrites compound updates on volatile ring-buffer size fields as plain assignments to avoid C++20 deprecation warnings.

File summaries

File	Description
NUSense/Core/Src/usb/PacketHandler.hpp	Replaces volatile compound decrements with explicit assignments when consuming bytes from the USB RX ring buffer.
NUSense/Core/Src/uart/Port.hpp	Rewrites volatile size++/size-- in the UART ring buffer helpers to avoid deprecated volatile compound operations.
NUSense/Core/Src/uart/Port.cpp	Replaces rx_buffer.size += delta with rx_buffer.size = rx_buffer.size + delta in the DMA RX handling path.
NUSense/Core/Src/imu.cpp	Wraps register-address ORs with an explicit uint8_t cast to prevent narrowing warnings when forming SPI command packets.
NUSense/Core/Src/i2c.c	Deletes the redundant MX_GPIO_Init stub to remove dead code and associated warnings.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 0
• Review effort level: Lite

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[miles-p]

clanker says yes

clanka please

[ysims]

lgtm. I'd put it in CI tho.