feat(fe): replace /authorize curtain with breathe-sparkle background

[MRmarioruci]

Updating the background animation on the authorize flow.

Changes

• Adds BreatheSparkleCanvas.svelte — a focused canvas that renders a 28px dot grid breathing as 0.5 + 0.5·sin(t·0.7 + (x+y)·0.004), with Perlin-noise–driven hollow-ring sparkles flaring softly across it. Reuses the existing PerlinNoise3D util.
• Swaps FlairCanvas + DROP_WAVE_ANIMATION in RedirectAnimationView.svelte for the new canvas. Removes the now-unused triggerAnimation/clearAnimation plumbing in this view.

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 7d1a848.

Security Overview

• 🔎 Scanned files: 2 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/6d3e3b61-710b-4b2b-9c0b-43458b6314b6?scanId=0d640e5b-706f-4e97-aee9-2556919961cf&codeScanTypes=PrScan&tab=issues

Detected Code Changes

| Change Type | Relevant files

... (code changes summary truncated to fit VCS comment limits.)

[Copilot]

Pull request overview

This PR updates the desktop authorize redirect “curtain” background by introducing a new breathing dot-grid canvas with Perlin-driven sparkles, and wiring it into the authorize redirect view in place of the existing FlairCanvas + drop-wave trigger plumbing.

Changes:

• Added BreatheSparkleCanvas.svelte to render the new breathing dot-grid + sparkle rings animation.
• Updated RedirectAnimationView.svelte to use BreatheSparkleCanvas and removed the unused triggerAnimation/clearAnimation bindings and effect.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/frontend/src/routes/(new-styling)/authorize/views/RedirectAnimationView.svelte	Swaps the authorize redirect background from FlairCanvas to BreatheSparkleCanvas and removes animation trigger plumbing.
src/frontend/src/lib/components/backgrounds/BreatheSparkleCanvas.svelte	New canvas-based background component implementing the breathing dot-grid and sparkle ring rendering loop.

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