chore: handle ineligible_guides in guides fetch response

[thomaswhyyou]

Description

This PR updates the guide client so it reads ineligible_guides from the fetch endpoint response and stores into the client state store, to prep ahead of the toolbar changes in downstream PRs.

As a reminder, this new field was introduced recently (here) to expose "ineligible markers", a minimal payload that explains which guide was evaluated ineligible for what reason. This information was previously inaccessible to the outside callers, but we want to surface it in the guide toolbar.

[linear]

KNO-11142 [SDK] Guide Toolbar v2 poc

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[thomaswhyyou]

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• feat: add selectable status indicator to toolbar v2 #848
• feat: add activatable status indicator to toolbar v2 #847
• feat: add guides list to toolbar v2 w/ targeting and archived indicators #846
• chore: split toolbar into v1 and v2 placeholder #845
• chore: handle ineligible_guides in guides fetch response #844 👈 (View in Graphite)
• chore: force select only the matching guide when forced guide key is set #843
• main

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[thomaswhyyou]

@cursor review

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Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (thomas-kno-11142-sdk-guide-toolbar-v2-poc-1@8c99027). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                              Coverage Diff                               @@
##             thomas-kno-11142-sdk-guide-toolbar-v2-poc-1     #844   +/-   ##
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Files with missing lines	Coverage Δ
packages/client/src/clients/guide/client.ts	88.64% <100.00%> (ø)
packages/client/src/clients/guide/types.ts	100.00% <ø> (ø)

[thomaswhyyou]

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