Move per-core CPU/GPU into horizontal header lines

[abosnjakovic]

What

Relocates per-core CPU (C0…) and GPU (G0…) usage from the right-side vertical panel into two full-width horizontal lines directly under the KPI header, in tight label:percent form (e.g. cpu C0:10% C1:7% …). The timeline graph now reclaims the full width.

Why

The vertical per-core column ate 20% of the timeline width and was awkward to scan. Two compact horizontal rows under the header read more naturally and free the chart to span the full terminal.

Details

• src/ui.rs
  • Reworked the main vertical layout: header → cpu line → gpu line → separator → full-width timeline.
  • Added render_cpu_cores_line / render_gpu_cores_line (thin wrappers over a shared render_cores_line helper) that build a single clipping Line of per-core cells; percentages are colour-graded by load via the existing get_gradient_color.
  • Removed the old render_cores_panel, render_cpu_cores_panel, render_gpu_cores_panel, and render_core_dot_line.
• src/app.rs — removed the now-unused get_cpu_count.
• src/theme.rs — dimmed the live-edge cursor (THEME.cursor) from white to Rgb(90, 90, 100). With the timeline now full-width, the "now" marker sits at the screen edge; dimming stops it reading as a stray white bar while keeping it visible as a marker.

Verification

• cargo build clean, cargo clippy clean, no dead-code warnings.
• Per-core rows render under the header; timeline spans full width; narrow terminals clip the core lines cleanly (no wrap, no panic).

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