fix(vscode): show routed model name for auto-routed free sessions

[kilo-code-bot]

What

The model usage panel showed just free for kilo-auto/free sessions instead of the concrete routed model.

Why

The backend usage aggregation prefers the step-finish part's model.modelID (the concrete routed model, e.g. tencent/hy3:free) over the message tier id, so the webview already receives the right value. But modelUsageName in webview-ui/src/context/model-usage.ts stripped it incorrectly: its sub-provider prefix rule /^[^:]+:\s*/ used \s* (zero-or-more whitespace), so it matched the colon inside the id tencent/hy3:free, removed tencent/hy3:, and left only free.

Fix

Change \s* to \s+ so the rule only strips a genuine "Provider: " display-name prefix (always followed by whitespace), not the :free colon in a model id. This aligns the webview with the CLI's KiloRoutedModel.displayName, which already uses \s+. The id then flows through the existing provider-prefix strip and displays as hy3:free.

Added a regression test for the routed free-variant id.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• packages/kilo-vscode/webview-ui/src/context/model-usage.ts
• packages/kilo-vscode/tests/unit/model-usage.test.ts
• .changeset/routed-free-model-name.md

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_{Reviewed by claude-sonnet-5 · Input: 14 · Output: 4.7K · Cached: 274.2K}

_{Review guidance: REVIEW.md from base branch main}