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Update pubspec dependencies, refactor progress indicators, and enhance README documentation

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packages/progress_indicator_m3e/README.md
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# progress_indicators_m3e
Material 3 **Expressive** progress indicators for Flutter:
# progress_indicator_m3e (spec build)
- `LinearProgressM3E` — determinate, indeterminate, **buffer**, **query**, with **flat** or **wavy** shape
- `CircularProgressM3E` — determinate & indeterminate, **flat** or **wavy** stroke (animated for indeterminate)
- `ProgressWithLabelM3E` — compose a linear bar with inline/top/bottom/center labels
**Visual rules implemented**
- Active and track never overlap.
- Circular ring is *broken* around the active sweep.
- Squiggle variants (48/52) draw a sine-like stroke inside the ring with 2dp clearance.
- Linear shows two lanes (active above, track below) with fixed gap and end-dot, per table.
All widgets read **M3E tokens** (`m3e_design`) for color, sizing, and typography.
## Defaults (from the spec illustrations)
- Linear: default thickness 4dp; configurable via `size` or `strokeHeight`
- Linear (wavy): `wavelength=40dp`, `amplitude≈height/3`, **4dp** left/right inset
- Circular: small/medium/large diameters ≈ 24/32/48 with stroke ≈ 3/4/6
- Circular (wavy): default **10 waves** around the circle, amplitude ≈ 35% of stroke
## Quick start
```dart
import 'package:progress_indicators_m3e/progress_indicators_m3e.dart';
// Linear (wavy, determinate)
LinearProgressM3E(
value: 0.62,
shape: LinearBarShapeM3E.wavy,
);
// Circular (wavy, indeterminate)
const CircularProgressM3E(
shape: CircularBarShapeM3E.wavy,
);
// Linear (buffer) flat
LinearProgressM3E(
variant: LinearProgressM3EVariant.buffer,
value: 0.3,
bufferValue: 0.6,
);
// Circular (flat) with center label
CircularProgressM3E(
value: 0.5,
showCenterLabel: true,
);
```
## Monorepo layout
```
packages/
m3e_design/
progress_indicators_m3e/
```
`pubspec.yaml` references `../m3e_design`.
## Accessibility
- Provide `semanticLabel` and (for determinate) the widgets expose a numeric **value** for screen readers.
- Indeterminate wavy animations use modest motion; gate the speed with a future `m3e_design.motion` flag if you support "reduce motion".
## License
MIT
**Linear variants**
- `flatXS` — track 4, gap 4, dot Ø4, dotOffset 4, trailing 4
- `flatS` — track 8, gap 4, dot Ø4, dotOffset 2, trailing 8
- `wavyM` — track 4, wave amp 3, period 40, gap 4, dot Ø4, dotOffset 2, trailing 10
- `wavyL` — track 8, wave amp 3, period 40, gap 4, dot Ø4, dotOffset 2, trailing 14