feat(views): set-default-view command

Phase 2 of the default-view spec: the command that sets the default that phase 1 reads. It's the v D slot the keybinding work reserved (the binding itself lands in phase 3).

From a buffer that's showing a local view, pearl-set-default-view offers that view as the default. Otherwise it prompts over the local-view names with a my-open-issues sentinel on top that clears the default. Quitting leaves it unchanged.

pearl--persist-default-view writes through customize-save-variable so the choice survives a restart. In accounts mode it updates the active account's :default-view and preserves the account's other plist keys, the same metadata-preserving rewrite local-view edits use. In legacy mode it writes the global pearl-default-view.

Eight tests: persist scope-targeting and key preservation in both modes, plus the offer, prompt, clear, and cancel paths. Suite 801 to 809, compile and lint clean.

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