feat: the cache and slackware cards move to quickshell

Both cards are now drawn by quickshell, so the conky copies go: the two
widgets, their samplers and texeci lines, their fixtures and icons, and
du_parse with human_bytes, which only the cache card used. kv_parse stays
for breaktimer; its test now runs on an inline string. README gains a
Samplers section listing what conky still schedules, and DESIGN.md's
examples point at the cards that remain. Their slots in the layout are
left open.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 4 insertions, 48 deletions

diff --git a/lib/card.lua b/lib/card.lua
index 0a93c88..0869ce9 100644
--- a/lib/card.lua
+++ b/lib/card.lua
@@ -215,8 +215,6 @@ end
 -- fontconfig alone: a missing glyph draws as an invisible blank and a wrong
 -- codepoint as a plausible neighbour, so neither fails visibly.
 M.ICON = {
-  cache      = '\u{F0ABA}',  -- folder-clock
-  slackware  = '\u{F318}',   -- linux-slackware
   breaktimer = '\u{F13AB}',  -- timer
   calendar   = '\u{F0E17}',  -- calendar-month
   immich     = '\u{F02F9}',  -- image-multiple
@@ -315,7 +313,7 @@ end
 --
 -- This counts codepoints, not rendered width, so it does not account for a
 -- double-width CJK glyph. That is the right trade here: the strings it cuts
--- are cache directory names and hardware model strings. Measure with
+-- are calendar titles and place names. Measure with
 -- M.measure when true rendered width matters.
 function M.truncate(s, limit)
   s = tostring(s or '')
diff --git a/lib/data.lua b/lib/data.lua
index 6b32f07..1b4c64f 100644
--- a/lib/data.lua
+++ b/lib/data.lua
@@ -16,55 +16,13 @@ function M.slurp(path)
   return s
 end
 
--- Human-readable size to bytes: '1.1G' -> 1181116006.
---
--- Needed because du -sh is what the sampler runs (its output is also what the
--- card displays), and 'biggest' has to be decided numerically: sorted as
--- strings, '245M' beats '1.1G'.
-local SUFFIX = { K = 1024, M = 1024^2, G = 1024^3, T = 1024^4, P = 1024^5 }
-
-function M.human_bytes(s)
-  if type(s) ~= 'string' then return nil end
-  local n, suf = s:match('^%s*([%d%.]+)%s*([KMGTP]?)')
-  n = tonumber(n)
-  if not n then return nil end
-  return n * (SUFFIX[suf] or 1)
-end
-
--- Parse `du -sh` output: the first line is the total, the rest are children
--- already sorted largest-first by the sampler. Returns nil when there is
--- nothing usable, so the widget can draw its "no data" state.
-function M.du_parse(text)
-  if type(text) ~= 'string' or text == '' then return nil end
-  local lines = {}
-  for line in text:gmatch('[^\n]+') do lines[#lines + 1] = line end
-  if #lines == 0 then return nil end
-
-  local function entry(line)
-    local label, path = line:match('^(%S+)%s+(.+)$')
-    if not label then return nil end
-    return { label = label, bytes = M.human_bytes(label) or 0,
-             name = path:match('([^/]+)/?$') or path, path = path }
-  end
-
-  local total = entry(lines[1])
-  if not total then return nil end
-  local items = {}
-  for i = 2, #lines do
-    local e = entry(lines[i])
-    if e then items[#items + 1] = e end
-  end
-  return { total = total, items = items }
-end
-
 -- Parse 'key value' lines into a table of strings.
 --
--- Values stay strings and are converted by the caller. The sampler writes
--- epochs as integers and the widget decides whether an age reads as hours or
--- days; a parser that guessed would have to know that.
+-- Values stay strings and are converted by the caller; a parser that guessed
+-- types would have to know what each key means.
 --
 -- Only the first space separates, so a value keeps its own spaces:
--- 'version Slackware 15.0+' yields 'Slackware 15.0+', not 'Slackware'.
+-- 'title Long break' yields 'Long break', not 'Long'.
 function M.kv_parse(text)
   local out = {}
   if type(text) ~= 'string' then return out end