feat: show current zoom level while zooming

[oz-for-oss]

Closes #9576

Summary

• Add a transient top-centered workspace HUD showing the current UI zoom percentage after zoom in, zoom out, and reset actions.
• Share zoom stepping logic with tests so min/max clamps still report the current clamped value and invalid stored zoom values do not show the HUD.
• Apply zoom factor changes from workspace window-settings updates so keybinding-driven zoom changes take effect immediately.

Validation

• cargo test --manifest-path /workspace/warp/Cargo.toml -p warp adjusted_zoom_level
• cargo fmt --manifest-path /workspace/warp/Cargo.toml -- app/src/workspace/view.rs app/src/workspace/view/zoom_level_hud.rs could not run because cargo-fmt/rustfmt is not installed in this environment.

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Overview

This spec PR adds product and technical specs for a transient, non-interactive zoom-level HUD shown after user-initiated zoom actions. The product spec covers goals, non-goals, UX behavior, boundaries, validation, and open design questions; the tech spec maps the behavior to the existing zoom model, workspace action paths, overlay rendering approach, tests, risks, and follow-ups.

Concerns

• No blocking concerns found for completeness, clarity, feasibility, issue alignment, internal consistency, or high-level security.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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