feat(stream): replace session-started splash with minimal Connected badge

[zortos293]

This PR replaces the full-screen session-started splash screen with a compact, top-center "Connected" badge that briefly appears when streaming begins.

• Refactor SessionStartedSplash from full-screen card to minimal badge with checkmark icon
• Update badge to animate in from top-center and auto-dismiss after 2.4 seconds
• Remove backdrop, orbs, rings, shimmer effects, and progress bar from splash component
• Simplify motion variants from complex multi-part animations to single badge enter/exit
• Reduce visibility duration from 3s to 2.4s for quicker non-intrusive feedback
• Remove splash visibility check from stats HUD so overlay displays immediately
• Update locale text from "Session started" to "Connected" for brevity
• Update CSS comment from "Session ready splash" to "Session ready badge"

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Note

Low Risk
UI-only stream feedback and styling changes with no auth, session, or streaming protocol impact.

Overview
Replaces the full-screen “Session started” splash (blurred backdrop, card, game title, progress bar) with a small top-center pill that shows a checkmark and “Connected” (stream.connectedBadge.title), auto-dismissed after 2.4s (was 3s).

SessionStartedSplash is reduced to a single motion variant and no longer renders kicker, game name, or decorative layers; copy moves off the old stream.sessionStarted strings for the badge label.

StreamView stops gating the stats HUD on splash visibility, so stats can appear while the badge is still showing.

CSS repositions .sv-ready-splash to the safe-area top and restyles .sv-ready-splash-card as a compact chip, removing the large splash keyframes and orb/ring/shimmer rules.

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