feat(ai): Display token count in agent usage footer

[GabVS15]

Description

Closes #12627

Adds token usage display to the AI agent conversation footer. Previously, the usage button only showed credits spent. Now it also shows the total token count for the conversation, both in the compact usage pill and in the expanded usage details panel.

Before:

3.5 credits ›

After (compact pill):

3.5 credits · 1247 tok ›

After (expanded details panel):

USAGE SUMMARY
Credits spent (total)   3.5 credits
Tool calls              2 calls
Tokens                  1247 tok     ← new
Models                  claude-...
Context window used     12%

Linked Issue

• Linked to [Feature Request] Show token count in AI agent usage footer #12627

Changes

• app/src/ai/blocklist/view_util.rs — added format_token_count() utility function
• app/src/ai/blocklist/block/view_impl/output.rs — appends token count to the compact usage pill
• app/src/ai/blocklist/usage/conversation_usage_view.rs — adds a "Tokens" row in the expanded usage details panel
• app/src/ai/blocklist/view_util_tests.rs — unit tests for format_token_count

Testing

• I have manually tested my changes locally with ./script/run

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@GabVS15

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This PR is linked to #12627, but no linked issue is marked ready-to-implement yet. Only repository maintainers apply that label, so please wait for a maintainer to mark the issue. Once it is marked, push a new commit or comment /oz-review to re-trigger review.

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[oz-for-oss]

@GabVS15

Every PR must be linked to a same-repo issue before Oz can review it.

This PR is linked to #12627, but no linked issue is marked ready-to-implement yet. Only repository maintainers apply that label, so please wait for a maintainer to mark the issue. Once it is marked, push a new commit or comment /oz-review to re-trigger review.

See the contribution guidelines for the full readiness model.

Powered by Oz

[GabVS15]

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[GabVS15]

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