[00132] Implement Rust Widget APIs for UI Effects and Visual Extras

[rorychatt]

Fixes #129

Summary — 00132: Implement Rust Widget APIs for UI Effects and Visual Extras

Implements the five Rust widget APIs missing per Issue #129:
Confetti, Animation, StackedProgress, WireframeCallout, WireframeNote.

Changes

• rusty/src/widgets/effects.rs (new) — EffectTrigger, Confetti, AnimationType,
  AnimationEasing, AnimationDirection, Animation. The animation kind is exposed as
  animation_type (→ animationType) rather than type, to avoid clobbering the widget
  discriminator the Widget derive writes under "type".
• rusty/src/widgets/progress.rs — added ProgressSegment and StackedProgress (a
  multi-segment progress bar with an on_select event), deliberately kept out of effects.rs
  since it is a progress bar, not an effect.
• rusty/src/widgets/wireframe.rs (new) — WireframeCallout and WireframeNote, design
  annotation widgets with no existing reference implementation; their prop shape is a documented
  assumption.
• rusty/src/widgets/mod.rs — module declarations and re-exports for all five new types.
• rusty/src/shared/widget_names.rs — registered the five new wire-format type strings in the
  Ivy widget-name mapping (animation/confetti/stacked_progress map to real Ivy widgets;
  wireframe_callout/wireframe_note are RustOnly). Not called for by the plan's own text, but
  required for cargo test to pass — a real, pre-existing gate this plan's new widgets tripped.
• rusty-server/src/bin/widget_harness.rs — Effects/Wireframe WidgetKind variants,
  EffectsApp (a Confetti per trigger, three Animation nodes, two StackedProgress bars — one
  wired to on_select), WireframeApp (a callout wrapping a TextBlock, an authored note).
• e2e/app/index.html — five new renderWidget case arms (confetti, animation,
  stacked_progress, wireframe_callout, wireframe_note) and matching CSS.
• e2e/tests/widgets/effects.spec.ts, wireframe.spec.ts (new) — Playwright coverage for
  every new widget, including the StackedProgress click → on_select → state round-trip.
• rusty-docs/docs/03_widgets/34_stacked_progress.md, 35_effects.md, 36_wireframe.md
  (new) — widget reference docs.

Verification

All 9 verifications resolved:

Verification	Result
RustFmt	Pass
RustClippy	Pass
VitePlusCheck	Skipped — no src/frontend files changed
RustBuild	Pass
NpmBuild	Pass
RustTest	Pass — 467+ passed across the workspace, 0 failed
VitePlusTest	Skipped — no src/frontend files changed (1 pre-existing, unrelated failure noted for context)
PlaywrightE2E	Pass — 149 passed
CheckResult	Pass

Commits

1. 6b7be02 — Add Confetti, Animation, StackedProgress, WireframeCallout, WireframeNote widgets
2. b2ba911 — Add E2E harness support for effects and wireframe widgets
3. 76aae58 — Add Playwright specs for effects and wireframe widgets
4. d634163 — Add widget docs for StackedProgress, Effects, Wireframe
5. 978ebf8 — EffectsApp: cover all three Confetti triggers, not just Click

Notable deviations

• StackedProgress lives in progress.rs, not effects.rs — an explicit, plan-sanctioned
  deviation from the source issue.
• widget_names.rs was edited even though the plan's Solution section doesn't mention it — a
  necessary fix for a pre-existing test gate the new widgets triggered.
• The E2E renderer's data-attribute names for the new widgets (e.g. data-label,
  data-selected) differ cosmetically from the plan's illustrative names (data-segment-label,
  data-segment-index) but follow the file's own existing convention more closely.

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Created using Ivy Tendril.