Paths library, roadmap and chapter screens aligned to the design

The Paths collection now matches the learning path design: your most recent path leads with its icon, the rest of your active paths are grouped under the skill domain the graph records for them, and single skills you study on their own are listed as compact rows instead of full path cards.

• Every path response now carries the learner-facing domain its skills belong to. A skill path takes its target skill's domain, and a role path takes the most common domain across its chapters, so the grouping comes from recorded graph membership rather than a guess.
• Cards read the layer first, then the chapter count, and the tabs carry their icons with the tighter spacing from the design.
• The search shortcut shows the command key on a Mac instead of Ctrl.
• The Completed tab shows what each finished path evidenced, when it finished, and your record totals. The Earned tab lists the certificates you have issued, with their record identifiers, and points to finished paths that still need one.
• The roadmap hero links to the path's sources, chapter rows carry their chapter number and status, and the weekly panel shows your recorded streak and the time commitment you set.
• Locked project and interview screens say what they will be built from and which roles you are tracking, using only recorded evidence.
• The practice tab tracks answered cards and lists your answers so far, the chapter page tracks the section you are on, and the sources tab marks source types and the ones from your reading list.