Mara on #774: previous batches were cookie-stripping rather than
prose migration. This batch actually moves substantive comment
prose from tabs.js into docs/web-ui.md.
Moved to docs/web-ui.md:
- Container row → **Icon layout + load strategy** sub-paragraph
(new): absolute-positioning rationale (so img load state can't
reflow row), fire-and-forget load pattern (no pre-check
reachability), favicon fallback chain, icon-unreachable class,
the immediate-fallback-when-stopped optimisation.
- Container row → **Pending-state derivation** paragraph (new):
three-source priority order (transient → in-flight queue → none),
why ContainerStateChanged isn't enough, the opRunning flag's role
in driving the pending-running class + spinner.
Collapsed in tabs.js:
- Icon block (~14 lines of WHY comments + pointer to docs) →
4-line pointer + behavioural one-liner. Drops #177 / #195 / #202
cookies en passant since their substance now lives in docs.
- Pending-state block (~22 lines split across two paragraphs) →
4-line pointer. Drops #769 self-cookie (the queued vs running
split lives in docs::Container row now).
- SharedWorker EventSource (~7 lines) → 5-line pointer. Drops
#448 cookie (the SSE multiplexing paragraph in docs already
has the design + Firefox throttling rationale; the in-code
comment was duplicating).
- M4TR1X tab gating (~4 lines) → 2-line pointer. Drops #607 cookie
in both tabs.js + docs/web-ui.md::Tab strip (the substance was
already in docs, just had the cookie attached).
tabs.js: 11 → 6 refs (92% reduction from baseline 73). Net effect:
~47 lines of substantive prose moved out of tabs.js into
docs/web-ui.md, where it belongs.
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