feat(sources): favorites, views, and filters via pick-source

Pearl now treats Linear sources (favorites, custom views, ad-hoc filters, saved queries) as one surface. `pearl-pick-source` is the unified picker: it lists every Linear favorite alongside every locally saved query, and dispatches by kind. View / project / cycle / label / user favorites resolve to runnable filter or view sources; issue / document / dashboard favorites open in the browser since they aren't lists.

The filter compiler grows id-based forms (`:label-id` and `:assignee-id`), so favorites that name a Linear entity (a user, a label) compile to rename-proof queries rather than fragile name matching. The ad-hoc builder gets a matching member-assignee option ("me / member / any"), so a one-off "what's a teammate working on?" doesn't require building a saved query first.

Two pre-existing builder bugs surfaced during verify and got fixed in the same pass. The builder previously passed display names straight to the compiler, but `:team` compiles to `team.key.eq` and `:project` to `project.id.eq`, so Linear rejected every builder run that pinned a team or project. Now the builder resolves the picked name to its key / id before assembling. And `pearl-list-issues-by-project` previously injected `:assignee :me` into the filter, hiding every teammate's work in the project. It now returns the whole project.

The save prompt on the builder was rewritten so the local-only nature is unambiguous, and the README grew a Sources section plus a keymap-table entry for `f s`.

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