feat(media): emit /media proxy paths, carry bearer header on client media fetches

feat: profile account section — banner, quota meter, legacy claim, real sign-out

feat: bearer-token transport with single 401 refresh-retry

Merge branch 'presenter-natural-tour' into backend-auth-quotas

feat: on-device AI (V2) — Gemma 3 1B structures quota-degraded cards locally

polished the app

stripped unnecessary stuff

Natural click-driven presenter tour

ADD AI PRESENTER

added massive features "Feed" and "Serendipity"

added chatHistory.

feat: update backend, UI, and pipeline features

fix: google-genai dep + OCR noise filter; add Dockerfile for HF deploy

Fixing the mess.

added concepts

add collections

Action_items

added knowledge graph.

somewhat works

Phase 1 done

frontend