Consolidate TuiCostTransparency into PricingTransparency feature flag

[Xavientois]

Description

Adds and consolidates the client-side PricingTransparency feature flag, replacing the old TuiCostTransparency flag entirely.

• Added FeatureFlag::PricingTransparency (mirrors the server-side PricingTransparencyEnabled flag in warp-server PR feat: surface resolved model + router config link in warping indicator (APP-4978) #14283, but is a fully independent mechanism — the two don't sync automatically).
• Replaced every FeatureFlag::TuiCostTransparency reference (in crates/warp_tui/src/usage.rs, usage_tests.rs, terminal_session_view_tests.rs) with FeatureFlag::PricingTransparency.
• Removed the old TuiCostTransparency variant and its DOGFOOD_FLAGS entry.
• Added PricingTransparency to DOGFOOD_FLAGS (on by default for the dev team). Not in PREVIEW_FLAGS/RELEASE_FLAGS; no flag_description() entry since that list is reserved for PREVIEW_FLAGS members.
• No behavior change: PricingTransparency was already effectively equivalent to the old flag's dogfood/staging enablement, so the TUI credits⇄dollars toggle behaves identically. This flag will also gate the not-yet-built GUI footer dollar display.

Note: this repo's base branch is master (no develop branch exists here).

Linked Issue

• N/A — part of an internal pricing-transparency saga (client-side flag consolidation).

Testing

• cargo check -p warp_features -p warp_tui — passes
• cargo test -p warp_tui (usage + terminal_session_view suites) — all pass, including the renamed-flag test paths
• cargo fmt -p warp_features -p warp_tui -- --check / cargo clippy -p warp_features -p warp_tui --all-targets --all-features -- -D warnings — clean
• git diff origin/master --stat: crates/warp_features/src/lib.rs, crates/warp_tui/src/{usage.rs,usage_tests.rs,terminal_session_view_tests.rs}

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Co-Authored-By: Warp Agent agent@warp.dev

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@Xavientois

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Overview

Adds the client-side FeatureFlag::PricingTransparency scaffold and enables it for Dogfood builds. There are no call sites yet, so this does not currently change user-visible behavior.

Concerns

• No blocking concerns found.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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