feat(web): persist model, thinking and fast mode in new threads

[maria-rcks]

What Changed

• persist the last used Codex model, thinking effort, and fast mode in local browser state
• use those values as the defaults for new threads
• keep explicit thread choices from being overwritten by the sticky defaults

Why

When you changed these in one thread and opened another, they reset.

This keeps the last used Codex settings sticky across thread switching and app reloads, without changing plan mode or access mode.

I and some people may prefer models in medium over high and only would want to use high in some threads

Closes #384

Supersedes #1004
Supersedes #1056

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

151224.mp4

(sorry for the crappy demo, the macbook its on its way)

Note

Persist model, reasoning effort, and fast mode settings across new threads

• Stores the selected Codex model and options (reasoningEffort, fastMode) as sticky state in useComposerDraftStore, persisted across sessions.
• New draft threads created via useHandleNewThread are pre-populated from sticky state, with the existing draft state taking priority over sticky defaults.
• ChatView writes to sticky state whenever the user changes the model (Codex only), effort, or fast mode.
• normalizeProviderModelOptions validates persisted options on load, discarding unrecognized effort values and falsy fastMode entries.

^{Macroscope summarized 92c5dee.}

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[zortos293]

Very needed QOL feature. It’s very annoying having to switch models every time you start a new thread.

[maskdotdev]

Updating fast mode in newer threads affects the mode in older threads see below:

Edit: Looked a bit deeper, it seems older threads only stay isolated if they have an explicit per thread override in the draft store. If they do not, they inherit the shared sticky value

pr1121-review-compressed-noaudio.mp4

[maria-rcks]

@maskdotdev lmk if its fixed now

[maskdotdev]

@maskdotdev lmk if its fixed now

awesome work! its fixed

[juliusmarminge]

would be good with another test that asserts precedence of draft state -> sticky composer settings -> defaults