Add quietdrift (quiet mode) support for roller shades

[sjafferali]

The open(), close(), and set_position() methods now accept a mode parameter (0 = performance, 1 = quiet) that controls motor speed. Previously open() and close() ignored the mode parameter and always sent hardcoded performance-mode commands.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
switchbot/devices/roller_shade.py	100.00% <100.00%> (ø)

... and 13 files with indirect coverage changes

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[Copilot]

Pull request overview

Adds “quietdrift” (quiet mode) support to Switchbot Roller Shade command generation so open(), close(), and set_position() can encode the requested motor mode into the BLE payload.

Changes:

• Update Roller Shade open()/close() to build the second command dynamically using the provided mode.
• Adjust Roller Shade command constants to use a shared base prefix for the second command.
• Expand unit tests to cover default vs quiet mode for open(), close(), and set_position().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
switchbot/devices/roller_shade.py	Builds open/close command payloads using the provided mode rather than hardcoding performance mode.
tests/test_roller_shade.py	Adds/updates tests asserting the correct command bytes are sent for performance vs quiet mode.

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[sjafferali]

@bdraco Please let me know if any changes are needed in order to get this merged in. Most of this functionality is modeled after switchbot/devices/curtain.py and I have tested the mode/speed arguments on my roller shades.