Add per-day practice sessions and customizable skills

- Settings: edit default skills as individual rows with add, remove,
  and reset-to-default controls (replaces the free-text textarea)
- Weekly note: seed each day with a practice Session carrying Dataview
  inline fields (skill::, minutes::, notes::); duplicate the Session
  bullet to log multiple sessions per day. Date is read from the day
  heading, so no hidden metadata is needed
- Skip blank skills when rendering the weekly skill table
- README: document the new settings controls and per-day session fields

README.md

@@ -6,7 +6,23 @@ Each week is a single markdown note in your vault containing:
 
 - **Goals** for the week
 - A **skills × days** tracking table
-- **Daily notes** sections, one per day
+- **Daily notes** sections, one per day — each seeded with a practice **Session**
+  carrying [Dataview](https://github.com/blacksmithgu/obsidian-dataview) inline
+  fields: `skill::`, `minutes::`, and `notes::`. Duplicate the Session
+  bullet to log multiple sessions in a day. The day's date is in its heading
+  (`### Monday — 2026-06-15`), so a future Dataview query or heat-map can read each
+  session's date, skill, and minutes without any hidden metadata.
+
+  Example day:
+
+  ```
+  ### Monday — 2026-06-15
+
+  - **Session 1**
+      - skill::
+      - minutes::
+      - notes::
+  ```
 
 ## Settings
 

main.ts

@@ -183,8 +183,14 @@ function renderTemplate(
 
 	const dailySections = days
 		.map((d, i) => {
-			const date = addDays(weekStart, i);
-			return `### ${DAY_NAMES[d]} — ${formatISO(date)}\n- \n`;
+			const date = formatISO(addDays(weekStart, i));
+			return `### ${DAY_NAMES[d]} — ${date}
+
+- **Session 1**
+    - skill::
+    - minutes::
+    - notes::
+`;
 		})
 		.join("\n");