feat(sessions): expand guided catalog — fuller therapy/coaching, a Family group, + search

[bmarshall511]

Expands the guided-sessions catalog (an additive extension of spec 16/48 — no new machinery, schema, or IPC).

What's new

• A "Family & relationships" group — 12 family-dynamics chat sessions: your family role, reflecting on a parent, sibling dynamics, boundaries with family, in-laws & extended family, inherited/generational patterns, repairing a rift, caring for an aging parent, reflecting on your parenting, co-parenting, distance/estrangement, and preparing for a gathering.
• Fuller Reflective & Coaching groups (~12 each) — +Worry Time, Spotting Thinking Traps, Three Good Things, Name the Feeling, Urge Surfing; +Building a Habit, Getting Unstuck, Time & Priorities, Playing to Your Strengths, Meet Your Future Self.
• A catalog search — with ~56 browsable sessions now, a search filters across every group by name, framework, or topic. Non-matching groups collapse away; a calm empty state shows when nothing matches.

Safety

• Every entry leads with the shared frame() not-therapy boundary.
• The Family group is never adult-gated (the adult === intimacy catalog invariant still holds — a unit asserts it).
• The 18+ intimacy group is never surfaced via search before the ack (a no-leak RTL guard + the E2E).

Verification

• typecheck (all) + lint clean; 934 core + 851 desktop unit (the new group + fuller-set assertions; 4 GuidedCatalog RTL incl. the no-leak guard).
• E2E: browse the Family group + filter across groups + empty state + clear.
• Visual QA (real Electron screenshots): the search sits cleanly above the catalog; filtering shows only matching cards — sleek and intentional.

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