fix(v0.6.3): cookie provider authType, Cline envelope, provider dropdowns, navbar, support popup
BUG FIXES

fix(cookies): provider cards showed "No Connections" despite a saved cookie. POST
/api/providers persists web-cookie connections with authType "cookie", but the main
providers page queried stats by authType "apikey" → 0 matches. Fixed the 3 call sites
(sort, card stats, toggle) to query "cookie" (page.js). Added a "cookie" mode branch to
/api/providers/test-batch so the "Test All" button on the Cookies Provider section works.
fix(cline): "Provider returned no completion choices for this model" on the model Test
button. Cline/ClinePass wrap non-streaming responses in a { data: { choices: [...] } }
envelope while SSE chunks are flat, so ping's parsed.choices check saw nothing.
- Unwrap the envelope in handleNonStreamingResponse (covers non-stream chat too).
- ping.js now also checks parsed.data.choices and accepts reasoning-only responses
  (thinking models spend the tiny probe budget on reasoning_content before any content).
fix(navbar): tighten Sidebar isActive — exact match + segment-boundary match so highlight
is never ambiguous. Root cause of the reported "stale" symptom was the loose startsWith.

UI/UX

Providers page: "Custom Providers" and "Cookies Provider" sections are now collapsible
dropdowns (default collapsed) with a chevron + count badge — the page no longer dumps
20+ cookie providers at once.
Support/Donation popup: added a "Support" button to the sidebar footer. Rewrote
DonateModal to be self-contained with hardcoded channels (PayPal, Ko-fi, Saweria/APAC)
and their QR codes — no remote fetch, works offline, no 404.