refactor(theme-studio): rename theme-selector to theme-studio

The tool authors themes from scratch -- palette, faces across every tier, live preview, export to a loadable deftheme. It never selects among existing themes, so "selector" mis-described it. Renamed the directory, the generated HTML and its title, the design spec, and every reference in the code, README, tests, and todo. No behavior change.

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+# theme-studio
+
+A self-contained tool for designing Emacs color themes by eye. One generated
+HTML page drives the whole theme: a palette, the syntax (font-lock /
+tree-sitter) layer, the built-in UI faces with a live mock-frame preview, and
+package-specific faces (org, magit, elfeed, plus every other installed package).
+Reassign colors against the palette, judge legibility with live WCAG-contrast
+readouts, then export a `theme.json` that a build step turns into
+`themes/<name>-*.el`.
+
+## Run
+
+```bash
+python3 generate.py          # writes theme-studio.html beside this script
+```
+
+Then open it in Chrome (Firefox had color-rendering flakiness during design):
+
+```bash
+WAYLAND_DISPLAY=wayland-1 google-chrome-stable theme-studio.html
+```
+
+During color work, disable Hyprland inactive-window dimming so colors read true:
+
+```bash
+hyprctl keyword decoration:dim_inactive false
+```
+
+## Files
+
+- `generate.py` — emits the HTML+JS, and embeds the package data. Edit here to
+  change layout or behavior.
+- `samples.py` — the six language code samples and the default syntax
+  category→color map (`COLS`). `generate.py` reads the part before the `cols=`
+  marker.
+- `package-inventory.json` — generated map of every installed package to the
+  faces it defines (see Package faces below). A committed data artifact.
+- `build-inventory.el` — refreshes `package-inventory.json` from a running
+  Emacs.
+- `theme-studio.html` — generated output. Regenerate; don't hand-edit.
+
+## What it captures
+
+Three tiers of faces, plus the palette:
+
+- **Palette** — named colors. Add by hex or with the in-page color picker
+  (saturation/value square, hue slider, palette reuse chips, live contrast
+  readout, and an any / AA+ / AAA legibility mask). Remove, rename, reorder with
+  arrows or drag. The colors serving as background and foreground are locked.
+- **Syntax** — every font-lock / tree-sitter category (keyword, string,
+  function, type, comment, and the rest), each with normal/bold/italic and a
+  contrast rating. Click a category to flash its tokens in the code; click a
+  token to flash its row.
+- **UI faces** — cursor, region, mode-line, fringe, line numbers, isearch, paren
+  match, link, error/warning/success, and the rest, foreground and background
+  per face, shown in a live mock Emacs buffer.
+- **Package faces** — per-package face tables with a live preview (below).
+
+## Package faces
+
+Pick an application from the dropdown to edit its faces. Each row has a
+foreground and background dropdown, bold/italic toggles, an `inherit` dropdown
+(base faces like `fixed-pitch`/`link` plus the app's own faces), a relative
+height stepper, a contrast readout, and a per-face reset. There's a per-app
+reset and a text filter for the large sets.
+
+Twenty applications have bespoke previews that exercise nearly all of their
+faces: org-mode (a document plus an agenda view), magit (a status buffer plus
+blame, reflog, sequence, bisect, and signature rows), elfeed (a search list and
+log), ghostel (a mock terminal with the 16 ANSI colors), mu4e (a headers list,
+message view, and compose stub), dashboard, lsp-mode (signatures, inlay hints,
+symbol highlights, rename), git-gutter, flycheck (a diagnostic line plus an
+error-list buffer), dired, dirvish (attribute columns, vc states, media, proc,
+narrow), calibredb (a library listing and detail view), erc (an IRC channel),
+org-drill (a cloze flashcard), org-noter, signel (a Signal chat), pearl (a
+ticket), slack (a channel with mrkdwn, attachments, blocks, and dialogs), and
+telega (chat entities, reactions, buttons, and webpage rendering), and shr (the
+built-in HTML renderer behind nov, eww, elfeed's article view, and HTML mail, so
+theming it themes all of them). Every other installed package is reachable too, with an editable
+table and a generic preview (each face name in its own colors), so any package
+can be themed. Clicking a face row flashes that face in the preview, and clicking
+a preview element flashes its row.
+
+**Inheritance** is modeled, not flattened: a face's effective color is resolved
+through its `inherit` chain and shown in the table and preview; setting an
+explicit color overrides it. `height` is a float multiplier off the base font
+and is read directly off the face (not cascaded through `inherit`, since Emacs
+multiplies float heights along a chain). The base monospace family is *not* the
+theme's job — it lives in `modules/font-config.el`; the tool owns only relative
+size and the `fixed-pitch` inherit relationships.
+
+### Refreshing the package inventory
+
+The reachable packages come from `package-inventory.json`. Regenerate it from a
+running Emacs (so it reflects what's actually installed), then rebuild the HTML:
+
+```bash
+emacsclient -e '(load "/home/cjennings/.emacs.d/scripts/theme-studio/build-inventory.el")'
+python3 generate.py
+```
+
+`build-inventory.el` groups each face by the package whose file defines it; it
+depends on the target Emacs having those packages loaded. Built-in faces are
+skipped (they're covered by the syntax and UI tiers).
+
+## theme.json contract
+
+The export (and what a build step consumes):
+
+```json
+{
+  "name": "dupre",
+  "palette": [["#67809c", "blue"], ["#e8bd30", "gold"]],
+  "assignments": {"kw": "#67809c", "str": "#5d9b86", "bg": "#000000", "p": "#ffffff"},
+  "bold": ["kw", "fnd"],
+  "italic": [],
+  "ui": {"region": {"fg": null, "bg": "#264364"}, "cursor": {"fg": null, "bg": "#a9b2bb"}},
+  "packages": {
+    "org-mode": {
+      "org-level-1": {"fg": "#67809c", "bg": null, "bold": true, "italic": false,
+                      "underline": false, "strike": false,
+                      "inherit": null, "height": 1.3, "source": "default"}
+    }
+  }
+}
+```
+
+- `assignments` maps syntax category keys to hexes; `bg` is the `default` face
+  background, `p` the foreground.
+- `ui` and `packages` faces carry `fg`/`bg` (hex or `null`), `bold`, `italic`,
+  `underline`, `strike`, and for package faces `inherit` (a face name or
+  `null`), `height` (a float, omitted at 1.0), and `source` (`"default"` seeded,
+  `"user"` edited, `"cleared"`). The converter writes `underline` as
+  `:underline t` and `strike` as `:strike-through t`.
+- The theme name is both the `name` field and the download filename. Import a
+  `theme.json` to start from a prior theme; a file with no `packages` key still
+  loads.
+
+`export` always downloads a fresh file; `save` (shown once a name is entered)
+writes the same file in place via the File System Access API.
+
+## Build step — `build-theme.el`
+
+`build-theme.el` converts a `theme.json` into a single self-contained
+`themes/<name>-theme.el` deftheme. JSON in, valid Emacs faces out, across all
+four tiers: `default` from `assignments.bg`/`.p`, the syntax categories mapped
+to their font-lock / tree-sitter faces (with the `bold`/`italic` sets applied),
+the UI faces passed through, and the package faces with `:inherit`/`:height`
+and weight/slant written.
+
+```bash
+emacs --batch -l scripts/theme-studio/build-theme.el \
+  --eval '(build-theme/convert-file "scripts/theme-studio/dupre-revised.json" "themes")'
+```
+
+Output is a flat generated deftheme, not the palette/faces/theme trio the
+original dupre ships — a `theme.json` carries resolved per-face hex, not dupre's
+semantic-mapping layer, so a flat deftheme is the faithful output and never
+clobbers the curated dupre files.
+
+One mapping limitation: the `dec` (decorator) syntax key has no independent
+Emacs face. Emacs renders decorators with `font-lock-type-face`, which the `ty`
+key already owns, so `dec` is omitted from the output and decorators follow the
+type color (as they do in stock Emacs). Tests live in
+`tests/test-build-theme.el` (Normal / Boundary / Error, plus a WCAG-contrast
+assertion on the round-tripped result).