feat(display): add active state parameter to hint animation

1. **Added `active` parameter to hint animation**
   - `updateHint()` now accepts a boolean `active` parameter across both display drivers (TFT and GFX)
   - When `active=true`: faster pulse animation (500ms period) during active hold
   - When `active=false`: slower pulse animation (2000ms period) during idle state

2. **Improved animation calculations**
   - Replaced modulo operator with `fmodf()` for cleaner float calculations
   - Standardized to `static_cast<uint8_t>()` for type conversions
   - Fixed GFX driver to use `color565()` method instead of manual bit shifting

3. **Updated hint display logic**
   - Now differentiates between "holding" state (fast pulse) and "idle" state (slow pulse)
   - Hint draws at both states when `holdStartX >= 0` (touch position captured)

4. **Added code formatter task**
   - New `mise.toml` task for running clang-format across all source files

- Users get **visual feedback differentiation**: fast pulsing during active hold vs. slow pulsing when idle
- More intuitive UI that clearly indicates whether a long-press is in progress or just waiting
- Cleaner, more maintainable code with standardized calculations and type conversions

libraries/KlubhausCore/src/IDisplayDriver.h

@@ -32,8 +32,8 @@ public:
     /// Track a long-press gesture; returns progress/completion.
     virtual HoldState updateHold(unsigned long holdMs) = 0;
     /// Idle hint animation (e.g. pulsing ring) while alert is showing.
-    virtual void updateHint(int x, int y) = 0;
-
+    /// @param active If true, show "holding" animation; if false, show "idle" animation.
+    virtual void updateHint(int x, int y, bool active) = 0;
     virtual int width() = 0;
     virtual int height() = 0;
 };