feat(R3.8): resume + up-next + autoplay + "needs transcode" notice

[detain]

R3.8 — Resume + Up-Next + autoplay + mkv/hevc "needs transcode" notice

The player's three closing moments, extracted from the locked R0 mockup (player-chrome.html:184-197). Part of the R3 player-surface redo; consumers stay pinned to #v0.7.0 until the aligned R6.6 release.

Added

• ResumePrompt.vue — on-open glass prompt ("Resume from {time}" / "Start over") shown when the persisted resume map holds an in-band (30s–95%) position for the current media. Resume seeks to the stored second (deferred to loadedmetadata when the duration isn't known yet) + plays; Start over seeks 0 + clearResume + plays. Auto-dismisses once playback begins.
• UpNext.vue — end-of-video card (poster thumb, "Up next" eyebrow, title, amber depleting countdown ring). On ended with a queued item it counts down 8s and auto-advances via usePlayerStore.next(...) when prefs.autoplay is on; static card with a manual Play now (+ Cancel) when off.
• TranscodeNotice.vue — opaque role=alert notice that replaces the silent black frame when a file can't direct-play: detected proactively by container extension (mkv/avi/wmv/ts/… on the stream URL or the library path) and reactively on a fatal <video> error (decode / src-not-supported). Center play + controls are suppressed under it.
• playback.ts — pure, DOM-free helpers: extensionOf, needsTranscode, isFatalMediaError, ringDashoffset + the up-next / ring constants.
• Player.vue: new optional streamUrlFor prop + play-next(media) emit; resume + transcode state is initialized synchronously in setup() (no first-frame black flash). New components + helpers exported.

Fixed

• usePlayerStore.next(resolveStreamUrl?) now threads a fresh stream URL into setCurrent (or clears it to '' when unresolved), so advancing the queue no longer leaves the previous item's streamUrl behind (the R3.7-noted stale-URL bug).

Review

Reviewer subagent → 3 LOW findings. #1 (real bug: replaying a just-ended video let the countdown advance the queue mid-replay) fixed — the playing watch now cancels the up-next too, with a new test. #2 accepted (forward-note for R3.9). #3 fixed (loading="lazy" on the up-next thumb). Re-verify: NO NEW FINDINGS.

Gates

• vue-tsc --noEmit clean · npm run build (vite 8) clean (dist rebuilt) · vitest run 1315 passing (+52) · components/player 99.6% lines (playback.ts 100%), Player.vue 98.18% lines · overall 97.23% lines · anti-slop clean.

Out of scope (R3.9)

PlayerPage.vue integration: real /media/:id/stream URL resolution + the streamUrlFor resolver wiring, the route-leave→showMiniPlayer() toggle, ambient backdrop, loading/error states.

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