Migrate sidebar to @posthog/quill

[adamleithp]

Summary

• Sidebar components (items, sections, menu, scroll area, task filter) swapped onto @posthog/quill primitives; deletes the old quill.css shim.
• Installs @posthog/quill@0.1.0-alpha.6 from npm (replacing the local link: install) and wires tokens.css / base.css / tailwind.css into globals.css per quill's shadcn-style install docs.
• TaskFilterMenu rebuilt as a quill DropdownMenu with radio selection + align-start so the active filter is visible.

Before:

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Test plan

• pnpm --filter code typecheck
• pnpm --filter code test
• Launch app, sidebar renders in light + dark, scroll works, section collapse/expand works
• Task filter dropdown opens, radio reflects current filter, selection updates list
• Sidebar item active/hover states still correct across Home, Skills, Tasks, Projects

🤖 Generated with Claude Code

[MattPua]

would it make sense to put this into the pnpm catalog?

[MattPua]

is there a reason we dont just use the file from Quill instead?

(Is there even a Command in quill)

[jonathanlab]

<3

[charlesvien]

LGTM