fix(sx1262): make HAL re-creatable and tolerate shared SPI3 bus

[yajatnarayan]

Adds sx1262_hal_destroy() and sx1262_deinit() so the driver can be torn down and rebuilt within a single boot. Previously, a second call to sx1262_hal_create() early-returned with the stale SPI device handle, mutex, and GPIO state from the first run, causing subsequent status reads to return corrupted values (e.g. 0x15 / chip_mode 1, an impossible value) even though the chip itself was healthy.

Also fixes a pre-existing bus-ownership bug: kernel_init() initializes SPI3 first via spi_init() because ST7789 shares the bus, so the sx1262_hal_create() call to spi_bus_initialize() was returning ESP_ERR_INVALID_STATE and treating it as fatal. Both error-cleanup paths also called spi_bus_free(SPI3_HOST), which would have torn down the bus ST7789 was actively using.

Changes:

• sx1262_hal_create(): treat ESP_ERR_INVALID_STATE from spi_bus_initialize as success; drop spi_bus_free() from error paths.
• sx1262_hal_destroy(): new function that removes the SX1262 SPI device, deletes the mutex, and clears is_initialized. SPI3 bus left intact.
• sx1262_deinit(): new function that stops the IRQ task (if running), calls sx1262_hal_destroy(), and clears s_is_initialized. Safe no-op when nothing is initialized.
• meshtastic_app_start(): calls sx1262_deinit() before sx1262_hal_create() so re-entry rebuilds the SPI device from scratch.

Description

Related Issue: Fixes # (issue)

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Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

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Checklist

• I have read the CONTRIBUTING.md document.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings during build.
• I have tested this change on physical hardware. (Please specify which target below)

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Hardware Testing Details

• NA

[yajatnarayan]

Formatting error on code from previous commits.