feat(ui): premium pass 2 — floating toolbars, transitions, chrome v1.104

Second design pass per the requested items: camera chrome, floating
bottom bars, typography hierarchy, color/spacing consistency, transitions.

- Bottom action bars on Result / Viewer / Group / OCR are now floating
  rounded toolbars (elevation 6dp, 24dp radius, 12dp margins) instead of
  full-bleed bars with a hairline divider — a modern, lifted look.
- Screen transitions: gentle horizontal slide on open/close via a theme
  windowAnimationStyle (220ms, decelerate/accelerate), so navigation feels
  smooth instead of instant cuts.
- Typography hierarchy: added Text.Title / Text.Caption / Text.BarLabel
  styles (weights, sizes, letter-spacing) for consistent headings/labels.
- Camera shutter redrawn as a cleaner white ring + inner disc (standard
  camera affordance).
- Added shadow / bar-surface tokens; consistent 12/24dp spacing & radii.

Constraint: ViewBinding ids and click targets unchanged; only chrome/visuals restructured. activity_group root gained xmlns:app for the card.
Confidence: high (builds clean) / medium (final look needs on-device check)
Scope-risk: local (layout/anim/theme only)
Reversibility: trivial
Directive: confirm on device; tune elevations/margins if the floating bars feel heavy on small screens.
Tested: assembleDebug + testDebugUnitTest exit=0 (22 tests).
Not-tested: on-device rendering of floating bars and slide transitions.
Related: v1.103 premium pass 1

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