fix(diff): preserve due/rec when absent from buffer line (#68)

* fix(diff): preserve due/rec when absent from buffer line

Problem: `diff.apply` overwrites `task.due` and `task.recur` with `nil`
whenever those fields aren't present as inline tokens in the buffer line.
Because metadata is rendered as virtual text (never in the line text),
every description edit silently clears due dates and recurrence rules.

Solution: Only update `due`, `recur`, and `recur_mode` in the existing-
task branch when the parsed entry actually contains them (non-nil). Users
can still set/change these inline by typing `due:<date>` or `rec:<rule>`;
clearing them requires `:Pending edit <id> -due`.

* refactor: remove project-local store discovery

Problem: `store.resolve_path()` searched upward for `.pending.json`,
silently splitting task data across multiple files depending on CWD.

Solution: `resolve_path()` now always returns `config.get().data_path`.
Remove `M.init()` and the `:Pending init` command and tab-completion
entry. Remove the project-local health message.

* refactor: extract log.lua, standardise [pending.nvim]: prefix

Problem: Notifications were scattered across files using bare
`vim.notify` with inconsistent `pending.nvim: ` prefixes, and the
`debug` guard in `textobj.lua` and `init.lua` was duplicated inline.

Solution: Add `lua/pending/log.lua` with `info`, `warn`, `error`, and
`debug` functions (prefix `[pending.nvim]: `). `log.debug` only fires
when `config.debug = true` or the optional `override` param is `true`.
Replace all `vim.notify` callsites and remove inline debug guards.

* feat(parse): configurable input date formats

Problem: `due:` only accepted ISO `YYYY-MM-DD` and built-in keywords;
users expecting locale-style dates like `03/15/2026` or `15-Mar-2026`
had no way to configure alternative input formats.

Solution: Add `input_date_formats` config field (string[]). Each entry
is a strftime-like format string supporting `%Y`, `%y`, `%m`, `%d`,
`%e`, `%b`, `%B`. Formats are tried in order after built-in keywords
fail. When no year specifier is present the current or next year is
inferred. Update vimdoc and add 8 parse_spec tests.

spec/parse_spec.lua

@@ -415,4 +415,73 @@ describe('parse', function()
       assert.are.equal('2026-03-15', meta.due)
     end)
   end)
+
+  describe('input_date_formats', function()
+    before_each(function()
+      config.reset()
+    end)
+
+    after_each(function()
+      vim.g.pending = nil
+      config.reset()
+    end)
+
+    it('parses MM/DD/YYYY format', function()
+      vim.g.pending = { input_date_formats = { '%m/%d/%Y' } }
+      config.reset()
+      local result = parse.resolve_date('03/15/2026')
+      assert.are.equal('2026-03-15', result)
+    end)
+
+    it('parses DD-Mon-YYYY format', function()
+      vim.g.pending = { input_date_formats = { '%d-%b-%Y' } }
+      config.reset()
+      local result = parse.resolve_date('15-Mar-2026')
+      assert.are.equal('2026-03-15', result)
+    end)
+
+    it('parses month name case-insensitively', function()
+      vim.g.pending = { input_date_formats = { '%d-%b-%Y' } }
+      config.reset()
+      local result = parse.resolve_date('15-MARCH-2026')
+      assert.are.equal('2026-03-15', result)
+    end)
+
+    it('parses two-digit year', function()
+      vim.g.pending = { input_date_formats = { '%m/%d/%y' } }
+      config.reset()
+      local result = parse.resolve_date('03/15/26')
+      assert.are.equal('2026-03-15', result)
+    end)
+
+    it('infers year when format has no year field', function()
+      vim.g.pending = { input_date_formats = { '%m/%d' } }
+      config.reset()
+      local result = parse.resolve_date('12/31')
+      assert.is_not_nil(result)
+      assert.truthy(result:match('^%d%d%d%d%-12%-31$'))
+    end)
+
+    it('returns nil for non-matching input', function()
+      vim.g.pending = { input_date_formats = { '%m/%d/%Y' } }
+      config.reset()
+      local result = parse.resolve_date('not-a-date')
+      assert.is_nil(result)
+    end)
+
+    it('tries formats in order, returns first match', function()
+      vim.g.pending = { input_date_formats = { '%d/%m/%Y', '%m/%d/%Y' } }
+      config.reset()
+      local result = parse.resolve_date('01/03/2026')
+      assert.are.equal('2026-03-01', result)
+    end)
+
+    it('works with body() for inline due token', function()
+      vim.g.pending = { input_date_formats = { '%m/%d/%Y' } }
+      config.reset()
+      local desc, meta = parse.body('Pay rent due:03/15/2026')
+      assert.are.equal('Pay rent', desc)
+      assert.are.equal('2026-03-15', meta.due)
+    end)
+  end)
 end)