Add 'Fix brightness control' setting to resolve torch strength level …

[yoyo53]

This commit adds a new user setting to fix devices where the flashlight ignores brightness level changes when using turnOnTorchWithStrengthLevel().

Problem:
On some Android devices, calling turnOnTorchWithStrengthLevel() when the torch is off results in the torch turning on at default brightness instead of the requested level. The Quick Settings tile was particularly affected, always activating at default level instead of the configured preferred level.

Solution:

• Added new 'Fix brightness control' setting (disabled by default)
• When enabled and torch is OFF, the code now calls setTorchMode(true) before turnOnTorchWithStrengthLevel() to ensure the level is applied correctly
• Optimization: Pre-activation only happens when torch is currently off, avoiding unnecessary flickering when changing levels during active use

Changes:

• Safe.kt: Added TORCH_PREACTIVATION constant
• strings.xml: Added user-friendly setting strings
• preferences.xml: Added switch preference in Flashlight controls category
• Camera.kt: Refactored sendLightLevel() methods to accept preactivate parameter
• MainActivity.kt: Load and pass setting to all torch activation calls
• SettingsTile.kt: Read setting and apply pre-activation logic
• VolumeButtonService.kt: Read setting and pass to Camera.sendLightLevel()

The setting is automatically reloaded in onResume() so changes take effect immediately without requiring app restart.