[clients] Trim what the clients see and give them a home

[frankrousseau]

Problem

• Clients reached pages and controls meant for the studio: entity and task type pages, task type names and library options, the action panel, the publish tab, the stats search, and the task type, download, onion skin, annotation, waveform and comparison controls of the playlist player.
• Their home was the studio production grid, with nothing to tell where a production stands.
• The comment panel of the playlist player was sized before it mounted, and a progress drag stopped when the mouse left the window.

Solution

• Close those routes to clients and hide the options and controls, keeping a Download .zip link on the playlist header.
• Give the clients a home: per production, the episode, shot and asset counts, the three latest playlists as cards and the progress by department, with links to the playlists and the stats pages; the studio name titles the topbar and a closable welcome message introduces the page, down to phone widths. Each overview loads once, a failed one shows empty, and main pack playlists link to the main pack.
• Size the comment panel from a style binding once the media is sized, and keep a drag alive while a mouse button stays pressed.