fix: remove 'Axon' prefix from selected model display in ChatTextArea

[code-crusher]

Summary

• Removed 'Axon' prefix from selected model label in / .
• Maintained 'Axon' prefix in the selector dropdown options list.
• Cleaned up redundant context window suffixes in dropdown option list items while preserving context info where appropriate for selected model display.
• Added utility unit tests for , , and .

Testing

• Unit tests added and passing in .
•  WARN  Unsupported engine: wanted: {"node":"20.19.2"} (current: {"node":"v24.15.0","pnpm":"10.8.1"})

axon-code@ check-types /Users/xblack/Documents/gravity/mattercode
turbo check-types --log-order grouped --output-logs new-only

• Packages in scope: @axon-code/jetbrains-plugin, @kilo-code/jetbrains-host, @matterai/axoncode, @roo-code/build, @roo-code/cloud, @roo-code/config-eslint, @roo-code/config-typescript, @roo-code/evals, @roo-code/ipc, @roo-code/playwright-e2e, @roo-code/telemetry, @roo-code/types, @roo-code/vscode-e2e, @roo-code/vscode-nightly, @roo-code/vscode-webview, @roo-code/web-evals, @roo-code/web-roo-code, axon-code, kilocode-docs
• Running check-types in 19 packages
• Remote caching disabled
@roo-code/evals:check-types: cache hit, suppressing logs 03dc062524b3d9d4
@roo-code/cloud:check-types: cache hit, suppressing logs 2654d267be41668c
@roo-code/types:check-types: cache hit, suppressing logs 9c032323043c6da0
@roo-code/telemetry:check-types: cache hit, suppressing logs 801445ecf72147c4
axon-code:check-types: cache hit, suppressing logs 525036f5e407bef7
@roo-code/playwright-e2e:check-types: cache hit, suppressing logs 1a0701d3a0fb7924
@roo-code/vscode-e2e:check-types: cache hit, suppressing logs 2f6a8e7fbf062de3
@roo-code/ipc:check-types: cache hit, suppressing logs f896c3664990a97a
@roo-code/build:check-types: cache hit, suppressing logs 55c57665c8735502
@matterai/axoncode:check-types: cache hit, suppressing logs e37cacb57b74a86a
@roo-code/vscode-webview:check-types: cache hit, suppressing logs 621fcb1de4b6f7a2
@roo-code/web-evals:check-types: cache hit, suppressing logs 17429a8a7d694303
@roo-code/web-roo-code:check-types: cache hit, suppressing logs c9889c14138d073f

Tasks: 13 successful, 13 total
Cached: 13 cached, 13 total
Time: 265ms >>> FULL TURBO verified cleanly.

[matterai-app]

✅ Reviewed the changes: Clean PR that adds utility functions to strip 'Axon' prefix and manage context suffixes in model labels. Code is well-tested with comprehensive unit tests. No issues found in the new code.