v0.11.7 — Default tab → Sources, fix sort-reset on reload

[jonathan-pap]

Summary

Two small UX defaults that were quietly wrong on the dashboard.

Changed

• Default tab on first load is now Sources (was Measures). Sources answers "where does this data come from?" — the question someone reaches for first when meeting an unfamiliar PBIP.
• Three call sites updated to keep them in sync:
  • `src/client/main.ts:183` — initial `activeTab` declaration
  • `src/client/main.ts:2112` — initial `switchTab(...)` after first render
  • `src/client/main.ts:2303` — `switchTab(...)` on report reload

Fixed

• Sort default flipped to ascending on every report reload. The state-reset at `__loadBrowserData` was setting `desc: false` while preserving the key — so the initial-load default (`usageCount` descending: busiest measures + columns first) silently inverted on every report swap.
• `src/client/main.ts:2202` — explicit re-application of `{ key: "usageCount", desc: true }` for both Measures and Columns on reload, matching initial render.

Test plan

• `npm test` — 276/276 pass (no test changes; the bug was in initial-state setup, not in any pure function)
• `npm run build:browser` — `docs/index.html` rebuilt
• After merge, hard-refresh live demo: lands on Sources; click Measures → confirm "Used ↓" sort indicator and busiest measures at top; reload sample → still on Sources; switch to Measures → still descending

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