feat(epg): compact timeline toolbar with icon-only Now and cycling zoom (#1557)

* feat(epg): compact timeline toolbar with icon-only Now and cycling zoom

Replace the 96px zoom range slider with a single icon button that cycles
day overview → by hour → detailed, make the Now button icon-only (label in
tooltip + aria-label), and add Ctrl/⌘ + wheel zoom around the cursor on the
ribbon (preventDefault keeps Chromium from page-zooming the same gesture).
Zoom math moves into TimelineZoomController so the component stays under
the max-lines limit. The channel/programme heading no longer carries a 60%
width cap and takes the space the controls free up.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix(epg): coalesce wheel-zoom anchoring and make the e2e zoom reset deterministic

- TimelineZoomController keeps a logical pending scrollLeft across a burst
  of wheel/pinch events and applies it in one animation frame, so every
  event anchors on the same minute instead of the stale DOM position
- the e2e settles on the detail preset from whichever band the wheel
  landed in (contrast checks need the block's time line, hidden at
  narrower tiers)
- zoom tooltip advertises ⌘/Ctrl per the repo's shortcut convention

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

.changes/epg-timeline-compact-controls.md

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+---
+type: feature
+area: epg
+---
+
+The EPG timeline toolbar is more compact: "Now" is an icon button, and the zoom slider is replaced by a single button that cycles day overview → by hour → detailed. Ctrl/⌘ + scroll (or a trackpad pinch) over the timeline zooms smoothly around the cursor. The channel and programme title now use all the space the controls free up.