[chamaquita-d3]

Closes #194

Merges upstream v0.1.6-nightly.20261030.3904 into custom-nightly.

File:lines	Class	custom-nightly	Upstream	Kept	Why
apps/server/src/preview/ServerBrowser.ts:481-509	disjoint	executable picks the packaged system browser, falling back to the headless shell; diagnose is skipped for a system browser	adds an agent-scope launcher (moves Chrome out of the server's cgroup) next to executable	Both: fork's executable and diagnose, plus upstream's launcher	The two options are independent fields of the same constructor call.
apps/server/src/preview/ServerBrowserContexts.ts:107-122	disjoint	launchOptions builds options with executablePath and prepends GPU/software rendering args from a one-time probe	launchOptions returns executable, and launch takes the executable and a start(executablePath) callback so the launcher path can replace it	Both: returns executable plus options and rendering args	Upstream's launcher must wrap every launch.
apps/server/src/preview/ServerBrowserContexts.ts:126-155 (fix)	fix	renderingArgs and probeGpu took executablePath inside the options and called launch(options, ...)	launch(executable, start) signature	renderingArgs(executable, options) and probeGpu(executable, options) launch through launch(executable, ...)	The merge compiled to a mismatch otherwise. The GPU probe now also runs through the agent-scope launcher.
apps/web/src/components/chat/TimelineUserMessageRow.tsx:497-499	disjoint	Bubble uses surface-glass [--glass-fill:var(--message-surface)] and p-3	Media-only messages get no bubble background or padding (!mediaOnly && ...)	Both: the glass surface and padding apply only when the message is not media-only	Fork changed the bubble's look, upstream changed when it appears.
pnpm-lock.yaml	lockfile	fork's dependencies	upstream lockfile	Upstream's lockfile, reconciled with pnpm install --ignore-scripts	Per the task; the install re-adds the fork's manifest additions.

Nothing was built or tested locally; fork CI typechecks and builds.

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