fix(web): remember selected pull request merge method

[QarthO]

What Changed

switching from merge method is persisted

Why

i like to squash and merge. i didnt like having to switch to squash every single time

Disclosure

Used AI (ox alpha btw) whole heartedly in the code, but i the human wrote this.

i really dont care if this gets merged, but i really would the problem to be solved

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Note

Low Risk
UI preference persistence only; merge still uses the repo’s allowed methods, so this does not change merge execution or permissions.

Overview
Remembers the last merge strategy the user picked (merge, squash, or rebase) across pull requests and sessions, instead of resetting to merge every time the panel opens.

The preference lives in uiStateStore and localStorage. Invalid or unknown values are ignored and default to merge. If a repository does not allow the saved method, the UI still falls back to the first allowed method so a persisted choice cannot force an unsupported merge.

^{Reviewed by Cursor Bugbot for commit e8e16b6. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Persist selected pull request merge method in useUiStateStore

• Moves pullRequestMergeMethod from local useState in PullRequestDetailPanel to the shared useUiStateStore so the selection survives component unmounts.
• Adds MERGE_METHODS validation, a setPullRequestMergeMethod pure function, and serialization/hydration support in parsePersistedState and persistState.
• Invalid or missing persisted values fall back to the default 'merge'.
• Risk: existing localStorage payloads without pullRequestMergeMethod will hydrate to 'merge' rather than a previously selected value.

^{Macroscope summarized e8e16b6.}

[macroscopeapp]

Approvability

Verdict: Skipped

Macroscope did not run approvability analysis for this PR. Macroscope could not determine whether this PR modifies its approvability configuration, so the PR was not approved automatically. A PR that may change the rules that govern approval is never approved automatically.