feat(tui): preserve selected thinking effort per agent per model for primary agents

[IdrisGit]

Issue for this PR

Closes#36703

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Variant (thinking effort) selection was stored keyed only by providerID/modelID, so Primary Agents sharing the same model would overwrite each other's setting. Now the key includes the agent name so each primary agent holds its own thinking effort independently. i.e name/providerID/modelID

How did you verify your code works?

1. Ran TUI locally using bun dev
2. Tested with same model on different agents with different thinking effort
3. On each cycle the thinking effort is preserved per agent per model

Screenshots / recordings

oc_preserve_thinking_effort.mp4

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found one potentially related PR:

Related PR:

• feat: add agent default variant handling in TUI and desktop #7156 - feat: add agent default variant handling in TUI and desktop — This PR addresses variant/thinking effort handling for agents in the TUI, which is related to your feature of preserving thinking effort per agent per model.

The search also returned a couple of other thinking/preservation-related PRs (#12567, #32604) but they're less directly related (subagent inheritance and session-level reasoning preservation).

Note: PR #36708 (your current PR) appears in all results, which is expected.

[soltrac]

this is very interesting to have

[github-actions]

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