FIX: prioritize fuel gauge in short cards

[merefield]

Why

This addresses #35

When horizontal quota cards become very short, the Bars view preserves its primary gauge and drops secondary telemetry first. Fuel Tank did the opposite at its minimum visual height: it replaced the fuel row with the RANGE label, and a two-row allocation could show only tank borders.

What changed

• keep the actual fuel row as the one-row Fuel Tank representation
• restore the range readout only when a second visualization row is available
• restore dim Empty/Full endpoint context only at three or more visualization rows
• retain the existing card-level priority that removes reset-cycle and FREE/USED telemetry before the primary visualization
• add focused tests for one-, two-, and three-row tanks and minimum-height quota cards

Impact

Fuel Tank now behaves like Bars under vertical pressure: the main quota signal remains visible while low-intensity labels and the reset timeline disappear first. Normal-height Fuel Tank cards retain their existing appearance and reverse-gauge direction.

Validation

• go test ./internal/ui
• go test -race -cover ./...
• go vet ./...
• git diff --check
• rebuilt the local binary for visual review

[Copilot]

🟢 Approval recommended

The behavior change is narrowly scoped, matches the stated intent, and is covered by targeted tests for the constrained-height cases.

Pull request overview

This PR adjusts the Fuel Tank meter’s height-constrained rendering so the primary “fuel row” is preserved at minimal heights, and secondary labels (range readout, then Empty/Full endpoints) are only shown when more vertical space is available—matching the Bars view’s prioritization behavior under vertical pressure.

Changes:

• Update renderFuelTankSized to prioritize the tank row at 1-row height, add the range readout at 2 rows, and add Empty/Full endpoints at 3+ rows.
• Preserve default Fuel Tank sizing behavior when no explicit height is provided.
• Add focused tests covering 1-, 2-, and 3-row tanks and a minimum-height Fuel meter area to ensure secondary telemetry drops before the tank.

File summaries

File	Description
internal/ui/meters.go	Changes Fuel Tank height prioritization so the tank row remains visible first, then restores secondary labels as height increases.
internal/ui/meters_test.go	Adds regression tests for short-height tank rendering and verifies minimum-height meter layout drops telemetry before the tank.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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