docs(user): dashboard, browsing, profile rewrites + new podcasts guide; trash stubs

Ground-truthed against the templates this pass:
- dashboard.md: real section kinds (system shelves incl. Continue
  Series, user collections, custom sections via /custom-section
  builder), Customize Dashboard panel semantics (per-library, drag,
  switches, 10-50 items, Save Changes), Refresh, This Week widget,
  per-item Read/Listen and progress-conflict resolve actions. The old
  page listed a wrong shelf set and never mentioned custom sections.
- library-browsing.md: the file was secretly titled 'Saving Custom
  Filters' and covered nothing else. Now the browsing page: All Books
  toolbar (search, Sort, Filters -> drawer hand-off, Save/Load/Clear
  saved filters), book detail as hub, series pages, podcasts split.
- profile-guide.md: field table ground-truthed from profile_form.templ
  (username/email DO remain editable there), audio defaults (speed,
  resume rewind, keep awake), timezone rendering contract, both theme
  doors (7-pick select vs 37-theme Appearance panel), Change Password
  with live checks, Danger Zone/Remove My Account + last-admin rule.
- podcasts.md NEW: the Podcasts page had zero documentation. Subscribing
  (Add Feed -> RSS URL, library, back-catalog download, download order,
  Add & Subscribe), Continue/All Feeds, Download All, player + Play as
  Sequence cross-link.
- Trashed user-areas.md, frontend-guide.md, settings-guide.md: stubs
  whose planned content now exists as real pages (or duplicates
  profile-guide). user-guide.md rewritten as the plain-language front
  door with a go-here-when table; index.md rows updated to match.
- ui-controls.md: 10 new gate-checked entries for every newly cited
  control (Add & Subscribe via templ-entity fragment).

docs/user/dashboard.md

@@ -1,52 +1,62 @@
 # Dashboard
 
-The Bookhoard dashboard provides a Carousel-style horizontal carousel interface for browsing your book library.
+The dashboard is your home screen: horizontal shelves ("sections") of your
+books, one row after another. What each shelf contains depends on the library
+you are looking at — including the **All Libraries** view, which mixes
+everything you can see.
 
-## Sections
+## The three kinds of section
 
-### Smart Sections
+| Kind | What fills it |
+| --- | --- |
+| **System shelves** | Bookhoard maintains them from your reading: **Continue Reading**, **Recently Added**, **Recently Read**, **Not Started**, **Continue Series** |
+| **Your collections** | Every collection you create appears as its own shelf |
+| **Custom sections** | Shelves you define yourself — by filter rules or by hand-picking books |
 
-Smart sections are automatically generated based on your reading activity:
+System shelves and collections are covered by their own guides (see
+[Sync Guide](sync-guide.md) for what "continue reading" means across devices,
+and [Collections](collections.md) for the shelves you build). This page is
+about arranging the rows.
 
-- **Continue Reading**: Books you're currently reading (progress between 0-100%)
-- **In Progress**: Books you've started (progress > 0%)
-- **Recently Added**: Newest items added to this library
-- **Recently Read**: Books you've completed (100% progress)
-- **Not Started**: Books you haven't read yet
+### This Week
 
-### User Collections
+The dashboard also shows a small **This Week** summary — your reading time
+and activity for the week so far. Click it to expand the detail.
 
-Your collections appear as sections on the dashboard. To show or hide a collection's section:
+## Customizing your shelves
 
-1. Select the library in the **Library** bar
-2. Click the **Customize Dashboard** icon button
-3. Toggle the collection on or off
-4. Click "Save Changes"
+1. Pick the library in the **Library** bar (a specific library, or
+   **All Libraries**) — settings are saved per library
+2. Click the **Customize Dashboard** button in the Library bar
+3. In the **Customize Dashboard** panel: drag sections into the order you
+   want, switch sections on or off, and set how many items each section
+   shows (10–50)
+4. Click **Save Changes**
 
-### Customizing Your Dashboard
+The **Refresh** button next to it re-reads your libraries without a full
+page reload.
 
-1. In the **Library** bar below the top bar, select the library you want to customize (a specific library, not "All Libraries")
-2. Click the **Customize Dashboard** icon button at the right end of the Library bar (next to Refresh)
-3. **Drag sections** to reorder them
-4. **Toggle visibility** with the switches
-5. **Adjust items per section** (10-50 items)
-6. Click "Save Changes"
+## Custom sections
 
-Settings are saved per library.
+A custom section is a shelf whose contents you define — either with the same
+filter rules the **Filters** drawer uses, or by picking the books yourself.
+You build one on the **Create Custom Section** page (at `/custom-section` on
+your server); once saved it behaves like any other shelf and can be ordered
+and hidden with everything else.
 
-### Library Switching
+## Reading and listening from the dashboard
 
-Use the **Library** dropdown in the bar below the top bar to switch between libraries (including "All Libraries"). Each library has its own dashboard settings.
+Point at a shelf and chevron buttons appear to scroll it. Every item carries
+a direct action: **Read** opens the web reader, **Listen** opens the audio
+player. If the same book has conflicting progress from two devices, the item
+grows a resolve action that takes you to conflict resolution — see the
+[Sync Guide](sync-guide.md).
 
-### Keyboard Navigation
+## Keyboard and touch
 
-- **Tab**: Navigate between sections and books
-- **Arrow Keys**: Scroll carousels horizontally
-- **Enter**: Open selected book
+- **Tab** moves between shelves and books; **Enter** opens the focused book
+- **Arrow keys** scroll the focused shelf sideways
+- On touch: swipe a shelf to scroll it, tap a cover to open it
 
-Hovering a carousel shows chevron buttons on either side for scrolling.
-
-### Touch Gestures (Mobile)
-
-- **Swipe**: Drag carousel left/right to scroll
-- **Tap**: Open book details
+*Finding your way back:* the dashboard is the page with the **Library** bar —
+the only place with the **Customize Dashboard** button.