Fix wt list column sizing, alignment, and headers

.claude/skills/writing-user-outputs/SKILL.md

@@ -1095,8 +1095,18 @@ eprintln!("{}", success_message(format!(
 
 ## Table Column Alignment
 
-- **Text columns** (Branch, Path): left-aligned
-- **Numeric columns** (HEAD±, main↕): right-aligned
+- **Text columns** (Branch, Path, Message): left-aligned
+- **Single-value numeric columns** (Age): right-aligned, so `now` and `4m` line
+  up on the unit
+- **Diff columns** (HEAD±, main↕): two right-aligned halves either side of a
+  separator (`+999 -999`)
+
+A header follows its content, except over a diff column, where it centres:
+pushed to either edge it stands over one half and reads as that half's label,
+leaving a lone `+1` stranded left of `HEAD±`.
+
+Rows carry no trailing padding. Padding places a cell; past the last one it
+places nothing, and a reader who selects the row gets it anyway.
 
 ## Snapshot Testing
 

README.md

@@ -164,11 +164,11 @@ This creates a new branch and worktree, then switches to it. Do your work, then
 
 ```console
 $ wt list
-  Branch        Status        HEAD±    main↕     main…±  Remote⇅  Commit   Age   Message
-@ feature-auth  +   ↑      +27   -8   ↑1       +31                4bc72dc  2h    Add authenticati…
-^ main              ^⇡                                    ⇡1      0e631ad  1d    Initial commit
+  Branch        Status      HEAD±     main↕    main…±    Remote⇅  Commit    Age  Message
+@ feature-auth  +   ↑      +27   -8   ↑1       +31                4bc72dc    2h  Add authenticati…
+^ main              ^⇡                                    ⇡1      0e631ad    1d  Initial commit
 
-○ Showing 2 worktrees, 1 with changes, 1 ahead, 1 column hidden
+○ Showing 2 worktrees, 1 with changes, 1 ahead, hidden: Path
 ```
 
 The `@` marks the current worktree. `+` means staged changes, `↑1` means 1 commit ahead of main, `⇡` means unpushed commits.

docs/public/schema/list-v2.json

@@ -425,6 +425,10 @@
           ],
           "description": "HEAD commit; null for unborn branches."
         },
+        "marker": {
+          "$ref": "#/$defs/Nullable_string",
+          "description": "Branch marker stored via `wt config state marker`; absent when none\nis set, null while the lookup is unresolved. The same string is the\nlast glyph in `display.symbols`."
+        },
         "pr": {
           "$ref": "#/$defs/Nullable_JsonPr",
           "description": "Open PR/MR; absent when none exists (or CI wasn't collected), null\nwhen the forge fetch failed."

docs/src/content/docs/claude-code.md

@@ -79,11 +79,11 @@ The Claude Code, Codex, OpenCode, and Gemini plugins track agent sessions with s
 
 ```console
 $ wt list
-  Branch       Status        HEAD±    main↕     main…±  Remote⇅  Path                 Commit   Age   Message
-@ main             ^⇡                                    ⇡1      .                    33323bc  1d    Initial commit
-+ feature-api      ↑ 🤖              ↑1        +1                ../repo.feature-api  70343f0  1d    Add REST API endpoints
-+ review-ui      ? ↑ 💬    +1        ↑1        +1                ../repo.review-ui    a585d6e  1d    Add dashboard component
-+ wip-docs       ? –       +1                                    ../repo.wip-docs     33323bc  1d    Initial commit
+  Branch       Status      HEAD±     main↕    main…±    Remote⇅  Path                 Commit    Age  Message
+@ main             ^⇡                                    ⇡1      .                    33323bc    1d  Initial commit
++ feature-api      ↑ 🤖              ↑1        +1                ../repo.feature-api  70343f0    1d  Add REST API endpoints
++ review-ui      ? ↑ 💬    +1        ↑1        +1                ../repo.review-ui    a585d6e    1d  Add dashboard component
++ wip-docs       ? –       +1                                    ../repo.wip-docs     33323bc    1d  Initial commit
 
 ○ Showing 4 worktrees, 2 with changes, 2 ahead
 ```

docs/src/content/docs/config.md

@@ -212,8 +212,8 @@ Valid built-in names:
 - `branch` — The branch name
 - `status` — Git status symbols, plus any user-defined status
 - `working-diff` — Uncommitted line changes against `HEAD`, including untracked files (header `HEAD±`)
-- `ahead-behind` — Commits ahead of and behind the default branch (header `main↕`)
-- `branch-diff` — Line changes against the default branch (header `main…±`)
+- `ahead-behind` — Commits ahead of and behind the default branch (header `main↕`, or whatever the default branch is called)
+- `branch-diff` — Line changes against the default branch (header `main…±`, likewise)
 - `summary` — An LLM-generated summary of the branch
 - `upstream` — Commits ahead of and behind the upstream tracking branch (header `Remote⇅`)
 - `ci` — CI status of the head commit
@@ -1381,13 +1381,13 @@ Markers appear at the end of the Status column, after git symbols:
 
 ```console
 $ wt list
-  Branch       Status        HEAD±    main↕     main…±  Remote⇅  Commit   Age   Message
-@ main             ^⇡                                    ⇡1      33323bc  1d    Initial commit
-+ feature-api      ↑ 🤖              ↑1        +1                70343f0  1d    Add REST API endp…
-+ review-ui      ? ↑ 💬    +1        ↑1        +1                a585d6e  1d    Add dashboard com…
-+ wip-docs       ? –       +1                                    33323bc  1d    Initial commit
+  Branch       Status      HEAD±     main↕    main…±    Remote⇅  Commit    Age  Message
+@ main             ^⇡                                    ⇡1      33323bc    1d  Initial commit
++ feature-api      ↑ 🤖              ↑1        +1                70343f0    1d  Add REST API endp…
++ review-ui      ? ↑ 💬    +1        ↑1        +1                a585d6e    1d  Add dashboard com…
++ wip-docs       ? –       +1                                    33323bc    1d  Initial commit
 
-○ Showing 4 worktrees, 2 with changes, 2 ahead, 1 column hidden
+○ Showing 4 worktrees, 2 with changes, 2 ahead, hidden: Path
 ```
 
 ### Use cases